ORCHARD PLANT LICE AND THEIR REMEDIES 
II 
Tobacco decoction in which two pounds of stems, or dust, or one pound 
of whole leaf tobacco was used to each three gallons of water and force¬ 
fully sprayed upon the exposed roots gave fairly good results but these were 
not equal in their killing and repelling effects to a lo to 15% kerosene 
emulsion. 
Black Leaf Dip used in the proportion of i gallon in 65 gallons 
of water gave results similar to the preceding. 
Scalecide used i to 40, i to 50 and i to 60 in water killed the lice 
fairly well but had very little repelling effect afterwards. 
Lump Lime applied in a manner similar to that employed with the 
tobacco stems, 10 to 20 pounds to a tree, was of little or no benefit. 
Soaps used for root treatment were of doubtful benefit. 
Some Wholly Unsuccessful Substances were, “Chloroleum” potash lye, 
wood ashes, salt, and flooding with water for several hours. 
THE GREEN APPLE APHIS. Aphis pomi DeGeer.) 
This is the common green louse curling the leaves of the apple tree 
in Colorado. While primarially a leaf feeder this louse also attacks the 
tender tips of growing shoots, especially grafts and water sprouts. This in¬ 
sect ranks close to the woolly aphis in extent of injuries to the apple trees. 
It also attacks the pear, the thorn and the quince quite freely. 
history 
This louse remains upon the apple, or closely allied trees, throughout 
the year and does not go upon other trees or vegetables. 
The first lice in the spring hatch from eggs that were deposited the 
previous fall upon the twigs of the trees. These first lice hatch a few days 
before the buds open and are ready to insert their sharp beaks into the first 
tender green tissue of the opening buds. These lice are all females and be¬ 
come fully grown in about two or three weeks, when they begin giving birth 
to living young. From this time on the lice increase very rapidly if they 
are not kept down by their natural enemies or the insecticides of the 
orchardist. 
At first all the lice are wingless, but by the loth to the 15th of May in 
the warmer portions of the state, and about two weeks later in the cooler 
orchard sections, the winged lice begin to appear and to fly from tree to 
tree and orchard to orchard with the prevailing winds. About the first week 
in September little brown wingless males and green wingless egg-laying 
females will appear, and a little later the females will begin laying green 
eggs that soon turn black upon the apple twigs. The freezing nights in 
November or early December kill all the lice and the eggs live over to hatch 
the following spring. • 
remedie:s 
Treatment for this insect may be for the destruction of the eggs and 
young lice before the buds open in the spring, or for the destruction of 
the lice upon the leaves during the growing season, 
TO DESTROY THE EGGS 
Kerosene Bmulsion in all our experiments has proven useless 
