. Bulletin. Forests and forestry. Insect Enemies of Shade Trees and Shrubs 99 b hiOf sulphur (33 degrees Beaurae) properly applied as a dormant spray, 1 part to 9 of water, is efficient. Where trees are sprayed for San Jose scale, this scale is also controlled at the same operation. 20. PINE LEAF SCALE {Chionaspis pinifoliae Fitch.) This is a native scale insect occurring from Maine to Cali- fornia. It is found principally on white, pitch and Austrian pines but other species of pines and spruces are also attacked. Transplants are apparently more sus- ceptible to attack than naturally grown ^ t
. Bulletin. Forests and forestry. Insect Enemies of Shade Trees and Shrubs 99 b hiOf sulphur (33 degrees Beaurae) properly applied as a dormant spray, 1 part to 9 of water, is efficient. Where trees are sprayed for San Jose scale, this scale is also controlled at the same operation. 20. PINE LEAF SCALE {Chionaspis pinifoliae Fitch.) This is a native scale insect occurring from Maine to Cali- fornia. It is found principally on white, pitch and Austrian pines but other species of pines and spruces are also attacked. Transplants are apparently more sus- ceptible to attack than naturally grown ^ trees. At times the scales are so,abund- ant that they whiten the evergreens and obscure the natural color of the foliage. The pine leaves turn pale and brownish and where infestation is severe, the branches may die. The female scale (Fig. 46, a) is pure white in color and in shape is a rather narrow oval which is wider posteriorly. The male (Fig. 46, b) is smaller and is somewhat narrowed. The scale passes the winter as eggs, which number 25 to 75 to each female scale. These eggs hatch from the middle to the latter part of May, the active young settle down, secrete their scale, the females completing their groA\i;h by the middle of July or the 1st of August. Probably there is usually but one brood in central !N^ew York, but further east in Massachusetts Mr. Cooley w^rites of two broods of this scale. However, he found it impossible to separate the generations, as scales in all stages of development were taken throughout the summer. Control Measures. Special control is usually unneces- sary. Spray with 10 per cent kerosene emulsion in May at the time most of the eggs are hatching or while the young are active; " Black Leaf 40 " applied at the same time, % pint to 100 gallons of water, is Fig. 46. The pine leaf scale, a. Adult female scale. 6. Male scale. Enlarged about 20 dia. (Original). Please note that these images are extracted from scanned page images
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
