Manual of Gardening (Second Edition) by L. H. Bailey
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L. H. Bailey >> Manual of Gardening (Second Edition)
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[Illustration: Fig. 229. Wire-covered box for protecting plants from
insects.]
[Illustration: Fig. 230 Protecting from cut-worms.]
The maggots that attack the roots of cabbages and cauliflowers may be
kept from the plant by pieces of tarred paper, which are placed close
about the stem upon the surface of the ground. Fig. 232 illustrates a
hexagon of paper, and also shows a tool used for cutting it. This means
of preventing the attacks of the cabbage maggot is described in detail
by the late Professor Goff (for another method of controlling cabbage
maggot see p. 201):--
[Illustration: Fig. 231 Protecting trees from cut-worms.]
[Illustration: Fig. 232 Showing how paper is cut for protecting cabbages
from maggots. The Goff device.]
"The cards are cut in a hexagonal form, in order better to economize the
material, and a thinner grade of tarred paper than the ordinary roofing
felt is used, as it is not only cheaper, but being more flexible, the
cards made from it are more readily placed about the plant without being
torn. The blade of the tool, which should be made by an expert
blacksmith, is formed from a band of steel, bent in the form of a half
hexagon, and then taking an acute angle, reaches nearly to the center,
as shown in Fig. 232. The part making the star-shaped cut is formed from
a separate piece of steel, so attached to the handle as to make a close
joint with the blade. The latter is beveled from the outside all round,
so that by removing the part making the star-shaped cut, the edge may be
ground on a grindstone. It is important that the angles in the blade be
made perfect, and that its outline represents an exact half hexagon. To
use the tool, place the tarred paper on the end of a section of a log or
piece of timber and first cut the lower edge into notches, as indicated
at _a,_ Fig. 232, using only one angle of the tool. Then commence at the
left side and place the blade as indicated by the dotted lines, and
strike at the end of the handle with a light mallet, and a complete card
is made. Continue in this manner across the paper. The first cut of
every alternate course will make an imperfect card, and the last cut in
any course may be imperfect, but the other cuts will make perfect cards
if the tool is correctly made, and properly used. The cards should be
placed about the plants at the time of transplanting. To place the card,
bend it slightly to open the slit, then slip it on to the center, the
stem entering the slit, after which spread the card out flat, and press
the points formed by the star-shaped cut snugly around the stem."
_Fumigating._
An effective means of destroying insects in glass houses is by
fumigating with various kinds of smoke or vapors. The best material to
use for general purposes is some form of tobacco or tobacco compounds.
The old method of fumigating with tobacco is to burn slowly slightly
dampened tobacco stems in a kettle or scuttle, allowing the house to be
filled with the pungent smoke. Lately, however, fluid extracts and other
preparations of tobacco have been brought into use, and these are so
effective that the tobacco-stem method is becoming obsolete. The use of
hydrocyanic acid gas in greenhouses is now coming to be common, for
plant-lice, white-fly, and other insects. It is also used to fumigate
nursery stock for San Jose scale, and mills and dwellings for such
pests and vermin as become established in them. The following directions
are from Cornell Bulletin 252 (from which the formulas in the succeeding
pages, and most of the advice, are also taken):--
"No general formula can be given for fumigating the different kinds of
plants grown in greenhouses, as the species and varieties differ greatly
in their ability to withstand the effects of the gas. Ferns and roses
are very susceptible to injury, and fumigation if attempted at all
should be performed with great caution. Fumigation will not kill insect
eggs and thus must be repeated when the new brood appears. Fumigate only
at night when there is no wind. Have the house as dry as possible and
the temperature as near 60 deg. as practicable.
"Hydrocyanic acid gas is a deadly poison, and the greatest care is
required in its use. Always use 98 to 100 per cent pure potassium
cyanide and a good grade of commercial sulfuric acid. The chemicals are
always combined in the following proportion: Potassium cyanide, 1 oz.;
sulfuric acid, 2 fluid oz.; water, 4 fluid oz. Always use an earthen
dish, _pour in the water first,_ and add the sulfuric acid to it. Put
the required amount of cyanide in a thin paper bag and when all is
ready, drop it into the liquid and leave the room immediately. For mills
and dwellings, use 1 oz. of cyanide for every 100 cu. ft. of space. Make
the doors and windows as tight as possible by pasting strips of paper
over the cracks. Remove the silverware and food, and if brass and nickel
work cannot be removed, cover with vaseline. Place the proper amount of
the acid and water for every room in 2-gal. jars. Use two or more in
large rooms or halls. Weigh out the potassium cyanide in paper bags, and
place them near the jars. When all is ready, drop the cyanide into the
jars, beginning on the top floors, since the fumes are lighter than air.
In large buildings, it is frequently necessary to suspend the bags of
cyanide over the jars by cords running through screw eyes and all
leading to a place near the door. By cutting all the cords at once the
cyanide will be lowered into the jars and the operator may escape
without injury. Let the fumigation continue all night, locking all
outside doors and placing danger signs on the house."
In greenhouses, the white-fly on cucumbers and tomatoes may be killed by
overnight fumigation with 1 oz. of potassium cyanide to every 1000 cu.
ft. of space; or with a kerosene emulsion spray or whale-oil soap, on
plants not injured by these materials.
The green aphis is dispatched in houses by fumigation with any of the
tobacco preparations; on violets, by fumigation with 1/2 to 3/4 oz.
potassium cyanide for every 1000 cu. ft. of space, leaving the gas in
from 1/2 to 1 hr.
The black aphis is more difficult to kill than the green aphis, but may
be controlled by the same methods thoroughly used.
_Soaking tubers and seeds._
Potato scab may be prevented, so far as planting infected "seed" is
concerned, by soaking the seed tubers for half an hour in 30 gal. of
water containing 1 pt. of commercial (about 40 per cent) formalin. Oats
and wheat, when attacked by certain kinds of smut, may be rendered safe
to sow by soaking for ten minutes in a similar solution. It is probable
that some other tubers and seeds can be similarly treated with
good results.
Potatoes may also be soaked (for scab) one and one-half hours in a
solution of corrosive sublimate, 1 oz. to 7 gal. of water.
_Spraying._
The most effective means of destroying insects and fungi however, in any
general or large way, is by the use of various sprays. The two general
types of insecticides have already been mentioned--those that kill by
poisoning, and those that kill by destroying the body of the insect. Of
the former, there are three materials in common use--Paris green,
arsenate of lead, and hellebore. Of the latter, the most usual at
present are kerosene emulsion, miscible oils, and the lime-sulfur wash.
Sprays for fungi usually depend for their efficiency on some form of
copper or sulfur, or both. For surface mildews, as grape mildew, dusting
flowers of sulfur on the foliage is a protection. In most cases,
however, it is necessary to apply materials in liquid form, because they
can be more thoroughly and economically distributed, and they adhere to
the foliage better. The best general fungicide is the bordeaux mixture.
It is generally, however, not advisable to use the bordeaux mixture on
ornamental plants, because it discolors the foliage and makes the plants
look very untidy. In such cases it is best to use the ammoniacal copper
solution, which leaves no stain.
In all spraying operations it is especially important that the
applications be made the very moment the insect or disease is
discovered, or in the case of fungous diseases, if one is expecting an
attack, it is well to make an application of bordeaux mixture even
before the disease appears. When the fungus once gets inside the plant
tissue, it is very difficult to destroy it, inasmuch as fungicides act
on these deep-seated fungi very largely by preventing their fruiting and
their further spread on the surface of the leaf. For ordinary
conditions, from two to four sprayings are necessary to dispatch the
enemy. In spraying for insects in home gardens, it is often advisable to
make a second application the day following the first one in order to
destroy the remaining insects before they recover from the first
treatment.
There are many kinds of machines and devices for the application of
sprays to plants. For a few individual specimens, the spray may be
applied with a whisk, or with a common garden syringe. If one has a few
trees to treat, however, it is best to have some kind of bucket pump
like those shown in Figs. 221, 222. On a lawn or in a small garden a
tank on wheels (Figs. 223, 224, 225) is handy and efficient. In such
cases, or even for larger areas, some of the knapsack pumps (Figs. 219,
220) are very desirable. These machines are always serviceable, because
the operator stands so near to his work; but as they carry a
comparatively small quantity of liquid and do not throw it rapidly, they
are expensive when much work is to be done. Yet, in ordinary home
grounds, the knapsack pump or compressed-air pump is one of the most
efficient and practicable of all the spraying devices.
For large areas, as for small orchards and fields, a barrel pump mounted
on a wagon is best. Common types of barrel pumps are shown in Figs. 226,
227, 228. Commercial plantations are now sprayed by power machines.
There are many good patterns of spraying machines, and the intending
purchaser should send for catalogues to the various manufacturers. The
addresses may be found in the advertising pages of rural papers.
As to nozzles for spraying it may be said that there is no one pattern
that is best for all purposes. For most uses in home grounds the cyclone
or vermorel type (Fig. 233) will give best satisfaction. The pump
manufacturers supply special nozzles for their machines.
[Illustration: Fig. 233. Cyclone or vermorel type of nozzle, single and
multiple.]
_Insecticide spraying formulas._
The two classes of insecticides are here described,--the poisons
(arsenites and white hellebore) for chewing insects, as the beetles and
all kinds of worms; the contact insecticides, as kerosene, oils, soap,
tobacco, lime-sulfur, for plant-lice, scale, and insects in such
position that the material cannot be fed to them (as maggots in the
underground parts).
_Paris green._--The standard insecticidal poison. This is used in
varying strengths, depending on the insect to be controlled and the kind
of plant treated. Mix the Paris green into a paste and then add to the
water. Keep the mixture thoroughly agitated while spraying. If for use
on fruit trees, add 1 lb. of quick lime for every pound of Paris green
to prevent burning the foliage. For potatoes it is frequently used
alone, but it is much safer to use the lime. Paris green and bordeaux
mixture may be combined without lessening the value of either, and the
caustic action of the arsenic is prevented. The proportion of the poison
to use is given under the various insects discussed in the
succeeding pages.
_Arsenate of lead._--This can be applied in a stronger mixture than
other arsenical poisons without injuring the foliage. It is, therefore,
much used against beetles and other insects that are hard to poison, as
elm-leaf beetle and canker-worm. It comes in the form of a paste and
should be mixed thoroughly with a small quantity of water before placing
in the sprayer, else the nozzles will clog. Arsenate of lead and
bordeaux mixture can be combined without lessening the value of either.
It is used in strengths varying from 4 to 10 lb. per 100 gal., depending
on the kind of insect to be killed.
Arsenite of soda and arsenite of lime are sometimes used with bordeaux
mixture.
_White Hellebore._--For wet application, use fresh white hellebore, 4
oz.; water, 2 or 3 gal. For dry application, use hellebore, 1 lb.; flour
or air-slaked lime, 5 lb. This is a white, yellowish powder made from
the roots of the white hellebore plant. It loses its strength after a
time and should be used fresh. It is used as a substitute for the
arsenical poisons on plants or fruits soon to be eaten, as on currants
and gooseberries for the currant-worm.
_Tobacco._--This is a valuable insecticide and is used in several forms.
As a _dust_ it is used extensively in greenhouses for plant-lice, and in
nurseries and about apple trees for the woolly aphis. Tobacco
_decoction_ is made by steeping or soaking the stems in water. It is
often used as a spray against plant-lice. Tobacco in the form of
_extracts,_ _punks,_ and _powders_ is sold under various trade names for
use in fumigating greenhouses. (See page 188.)
_Kerosene emulsion._--Hard, soft, or whale-oil soap, 1/2 lb.; water, 1
gal.; kerosene, 2 gal. Dissolve the soap in hot water; remove from the
fire and while still hot add the kerosene. Pump the liquid back into
itself for five or ten minutes or until it becomes a creamy mass. If
properly made, the oil will not separate out on cooling.
For use on dormant trees, dilute with 5 to 7 parts of water. For killing
plant-lice on foliage dilute with 10 to 15 parts of water. Crude oil
emulsion is made in the same way by substituting crude oil in place of
kerosene. The strength of oil emulsions is frequently indicated by the
percentage of oil in the diluted liquid:--
For a 10% emulsion add 17 gal. of water to 3 gal. stock emulsion.
For a 15% emulsion add 10 1/3 gal. of water to 3 gal. stock emulsion.
For a 20% emulsion add 7 gal. of water to 3 gal. stock emulsion.
For a 25% emulsion add 5 gal. of water to 3 gal. stock emulsion.
_Carbolic acid emulsion._--Soap, 1 lb.; water, 1 gal.; crude carbolic
acid, 1 pt. Dissolve the soap in hot water, add the carbolic acid, and
agitate into an emulsion. For use against root-maggots, dilute with 30
parts of water.
_Soaps._--An effective insecticide for plant-lice is _whale-oil soap._
Dissolve in hot water and dilute so as to obtain one pound of soap to
every five or seven gallons of water. This strength is effective against
plant-lice. It should be applied in stronger solutions, however, for
scale insects. Home-made soaps and good laundry soaps, like Ivory soap,
are often as effective as whale-oil soap.
_Miscible oils._--There are now on the market a number of preparations
of petroleum and other oils intended primarily for use against the San
Jose scale. They mix readily with cold water and are immediately ready
for use. While quickly prepared, easily applied, and generally
effective, they cost considerably more than lime-sulfur wash. They are,
however, less corrosive to the pumps and more agreeable to use. They are
especially valuable to the man with only a few trees or shrubs who would
not care to go to the trouble and expense to make up the lime-sulfur
wash. They should be diluted with not more than 10 or 12 parts of water.
Use only on dormant trees.
_Lime and sulfur wash._--Quicklime, 20 lb.; flowers of sulfur, 15 lb.;
water, 50 gal. The lime and sulfur must be thoroughly boiled. An iron
kettle is often convenient for the work. Proceed as follows: Place the
lime in the kettle. Add hot water gradually in sufficient quantity to
produce the most rapid slaking of the lime. When the lime begins to
slake, add the sulfur and stir together. If convenient, keep the mixture
covered with burlap to save the heat. After slaking has ceased, add more
water and boil the mixture one hour. As the sulfur goes into solution, a
rich orange-red or dark green color will appear. After boiling
sufficiently, add water to the required amount and strain into the spray
tank. The wash is most effective when applied warm, but may be applied
cold. If one has access to a steam boiler, boiling with steam is more
convenient and satisfactory. Barrels may be used for holding the
mixture, and the steam applied by running a pipe or rubber hose into the
mixture. Proceed in the same way until the lime is slaked, when the
steam may be turned on. Continue boiling for 45 min. to an hour, or
until sulfur is dissolved.
This strength can be applied safely only when the trees are dormant. It
is mainly an insecticide for San Jose scale, although it has
considerable value as a fungicide.
_Lime-sulfur mixtures and solutions for summer spraying_ are now coming
to take the place of bordeaux in many cases. Scott's self-boiled
lime-sulfur mixture, described in U. S. D. A. Bureau Plant Industry
Circ. 27 is now a standard fungicide for brown-rot and black-spot or
scab of the peach. Concentrated lime-sulfur solutions, either home
boiled or commercial, are effective against apple scab and have the
advantage of not russeting the fruit. Such concentrates, testing 32 deg.
Baume, should be diluted at about 1 gal. to 30 of water. Apply at same
time as with bordeaux. Add arsenate of lead as with bordeaux.
_Fungicide spraying formulas._
The standard fungicide is bordeaux mixture, made in several forms. The
second most important fungicide for the home gardener is ammoniacal
copper carbonate. Sulfur dust (flowers of sulfur) and liver of sulfur
(potassium sulfide) are also useful in dry or wet sprays for surface
mildews. The lime-sulfur wash, primarily an insecticide, also has
fungicidal property.
_Bordeaux mixture._--Copper sulfate, 5 lb.; stone lime or quicklime
(unslaked), 5 lb.; water, 50 gal. This formula is the strength usually
recommended. Stock mixtures of copper sulfate and lime are desirable.
They are prepared in the following way:--
(1) Dissolve the required amount of copper sulfate in water in the
proportion of one pound to one gallon several hours before the solution
is needed, the copper sulfate crystals being suspended in a sack near
the top of the water. A solution of copper sulfate is heavier than
water. As soon then, as the crystals begin to dissolve the solution will
sink, keeping water in contact with the crystals. In this way, the
crystals will dissolve much sooner than if placed in the bottom of the
barrel of water. In case large quantities of stock solution are needed,
two pounds of copper sulfate may be dissolved in one gallon of water.
(2) Slake the required amount of lime in a tub or trough. Add the water
slowly at first, so that the lime crumbles into a fine powder. If small
quantities of lime are used, hot water is preferred. When completely
slaked, or entirely powdered, add more water. When the lime has slaked
sufficiently, add water to bring it to a thick milk, or to a certain
number of gallons. The amount required for each tank of spray mixture
can be secured approximately from this stock mixture, which should not
be allowed to dry out.
(3) Use five gallons of stock solution of copper sulfate for every fifty
gallons of bordeaux required. Pour this into the tank. Add water until
the tank is about two-thirds full. From the stock lime mixture take the
required amount. Knowing the number of pounds of lime in the stock
mixture and the volume of that mixture, one can take out approximately
the number of pounds required. Dilute this a little by adding water, and
strain into the tank. Stir the mixture, and add water to make the
required amount. Experiment stations often recommend the diluting of
both the copper sulfate solution and the lime mixture to one-half the
required amount before pouring together. This is not necessary, and is
often impracticable for commercial work. It is preferable to dilute the
copper sulfate solution. Never pour together the strong stock mixtures
and dilute afterward. Bordeaux mixture of other strengths, as
recommended, is made in the same way, except that the amounts of copper
sulfate and lime are varied.
(4) It is not necessary to weigh the lime in making bordeaux mixture,
for a simple test can be used to determine when enough of a stock lime
mixture has been added. Dissolve an ounce of yellow prussiate of potash
in a pint of water and label it "poison." Cut a V-shaped slit in one
side of the cork so that the liquid may be poured out in drops. Add the
lime mixture to the diluted copper sulfate solution until the
ferro-cyanide (or prussiate) test solution _will not turn brown_ when
dropped from the bottle into the mixture. It is always best to add a
considerable excess of lime.
_"Sticker" or adhesive for bordeaux mixture._--Resin, 2 lb.; sal soda
(crystals), 1 lb.; water, 1 gal. Boil until of a clear brown color--one
to one and one-half hours. Cook in iron kettle in the open. Add this
amount to each fifty gallons of bordeaux for onions and cabbage. For
other plants difficult to wet, add this amount to every one hundred
gallons of the mixture. This mixture will prevent the bordeaux from
being washed off by the heaviest rains.
_Ammoniacal copper carbonate._--Copper carbonate, 5 oz.; ammonia, 3 pt.;
water, 50 gal. Dilute the ammonia in seven or eight parts of water. Make
a paste of the copper carbonate with a little water. Add the paste to
the diluted ammonia, and stir until dissolved. Add enough water to make
fifty gallons. This mixture loses strength on standing, and therefore
should be made as required. It is used in place of bordeaux when one
wishes to avoid the coloring of maturing fruits or ornamental plants.
Not as effective as bordeaux.
_Potassium sulfide._--Potassium sulfide (liver of sulfur), 3 oz.; water,
10 gal. As this mixture loses strength on standing, it should be made
just before using. It is particularly valuable for the powdery mildew of
many plants, especially gooseberry, carnation rust, rose mildew, etc.
_Sulfur._--Sulfur has been found to possess considerable value as a
fungicide. The flowers of sulfur may be sprinkled over the plants,
particularly when they are wet. It is most effective in hot, dry
weather. In rose houses it is mixed with half its bulk of lime, and made
into a paste with water. This is painted on the steam pipes. The fumes
destroy mildew on the roses. Mixed with lime, it has proved effective in
the control of onion smut when drilled into the rows with the seed.
Sulfur is not effective against black-rot of grapes.
_Treatment for some of the common insects._
The most approved preventive and remedial treatments for such insect
pests as are most likely to menace home grounds and plantations are here
briefly discussed. In case of any unusual difficulty that he cannot
control, the home-maker should take it up with the agricultural
experiment station in the state, sending good specimens of the insect
for identification. He should also have the publications of the station.
The statements that are here made are intended as advice rather than as
directions. They are chosen from good authorities (mostly from
Slingerland and Crosby in this case); but the reader must, of course,
assume his own risk in applying them. The effectiveness of any
recommended treatment depends very largely on the care, thoroughness,
and timeliness with which the work is done; and new methods and
practices are constantly appearing as the result of new investigations.
The dates given in these directions are for New York.
_Aphis or plant-louse._--The stock remedies for aphides or plant-lice
are kerosene emulsion and the tobacco preparations. Whale-oil soap is
also good. The tobacco may be applied as a spray, or in the house as
fumigation; the commercial forms of nicotine are excellent. (See page
194.) Be sure to apply the remedy before the leaves have curled and
afford protection for the lice; be sure, also, to hit the underside of
the leaves, where the lice usually are. The presence of lice on trees is
sometimes first discovered from the honey-dew that drops on walks.
Usually the emulsion is diluted with 10-15 parts of water for
plant-lice (see formula, page 194); but some of the species (as the dark
brown cherry-leaf louse) require a stronger emulsion, about 6 parts
of water.
The lady-birds (one of which is shown in Fig. 234) destroy great numbers
of plant-lice, and their presence should therefore be encouraged.
[Illustration: Fig. 234. Lady-bird beetle; larva above]
_Apple-maggot or "railroad-worm."_--The small white maggots make
brownish winding burrows in the flesh of the fruit, particularly in
summer and early fall varieties. This insect cannot be reached by a
spray as the parent fly inserts her eggs under the skin of the apple.
When full-grown, the maggot leaves the fruit, passes into the ground,
and there transforms inside a tough, leathery case. Tillage has been
found to be of no value as a means of control. The only effective
treatment is to pick up all windfalls every two or three days, and
either to feed them out or to bury them deeply, thus killing
the maggots.
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