304 Forty-second Report on the State Museum. [162] 



Apple-Tree Tent-Caterpillar: Clisiocampa Americana. (Country Gen- 

 tleman, for July 5, 1888, liii, p. 511, c. 2, 3 — 28 cm.) 



The best preventive of the injuries of this pest is the removal of 

 the belts of eggs, which'may be easily done when the trees are leafless. 

 The next best is to destroy the nest with its occupants as soon as it can 

 be recognized in the forks of the branches. The caterpillars may be 

 poisoned by spraying the foliage with one pound of London purple 

 in 200 gallons of water. The amount of harm done by this insect 

 is in diminishing the yield of fruit and its quality in proportion to 

 the amount of defoliation. The abundance of the insect the present 

 year in this State has been phenomenal, nothing approaching it having 

 been previously observed. For this no satisfactory cause can be 

 assigned. 



Honey-Dew on Hickory Leaves. (Country Gentleman, for July 5, 

 1888, liii, p. 511, c. 3 — 16 cm.) 



Hickory leaves, apparently of Carya alba, received from Clarksburg, 

 W. Va., are thickly coated, on their upper side, with "honey-dew." 

 Several species of Aphides are known to secrete this material, but in 

 some instances it results from a diseased condition of the leaves, causing 

 the excretion of a honeyed substance. In this case it is thought to have 

 been excreted from the leaves, for reasons stated. Keference is made to 

 Lachnus caryce occurring on the pig-nut, C. porcina. 



Grape-Leaf Galls. (Country Gentleman, for July 5, 1888, liii, p. 511 

 c. 4 — 8 cm.) 



Galls on a Rogers' seedling, from Worcester, Mass., are identified 

 those of Lasioptera vitis, the larva of which is briefly noticed. The best 

 preventive known of this attack is to remove and burn the infested 

 leaves and tips during early June, before the larvae leave them for their 

 further development in the ground. 



A New Pest Threatens the Hay Crop. (Albany Evening Journal, for 

 July 7, 1888, p. 7, c. 3.) 



A correspondent from Delmar, Albany county, N. Y., writes of a 

 minute insect infesting the base of the upper joint of Timothy grass, 

 and arresting its development. From examples submitted, it proves to 

 be a species of Thrips which may be identical with that which has long 

 invested June grass (see Report of Entomologist for 1886, in 40th 

 Rept. St. Museum Nat. Hist., pp. 96-98), but being at present in the 

 larval stage, can not be determined. 



Stalk-borer. (Country Gentleman, for July 12, 1888, liii, p. 532, 

 c. 1-2 — 16 cm.) 



A larva from Rock Hail, Md., where it is known as the " bud-worm," 

 and is infesting young corn by burrowing downward into the stalk, is 

 identified as Gortyna nitela Guenee. Distinguishing features of it 

 are given, vegetation that it attacks, and the best remedies for it. 

 Reference is made to other notices of the insect. 



