EEPORT OF THE SOCIETY" 115 



province there are local insect outbreaks by casual pests, which cause very 

 intensive injury. 



On June 26th, 1923, along the shore of the Riviere des Prairies the trees 

 were considerably defohated, and directly opposite on Isle Bizard defoliation 

 was almost complete. The caterpillars were found in numbers on many kinds 

 of trees and shrubs and the presence of injury proved it to be quite a general 

 feeder. The elms, maples and dogwoods were the most seriously injured but 

 apple, soft maple, chestnut and several other trees were injured to a lesser 

 degree. Trees in the open or windswept locations are usually only slightly 

 attacked but in sheltered areas the pest is most important. 



The caterpillars \vere in the last instar and measured from one and one- 

 quarter to one and two-fiiths inches in length. The head and mouthparts were 

 light, shiny green, except for the black or brownish tips of the mandibles. The 

 general body colour was apple green and there were dorsal and lateral conti- 

 nuous, broad, white stripes. Tubercles all white and the spiracles surrounded 

 by a black ring. The prolegs and thoracic feet were of the general body colour. 

 The general body colour was sometimes creamy or pinkish, probably the result 

 of the food plant upon which they had been feeding. Several of the larvae were 

 caged and supplied with apple foliage. After a short period they pupated and 

 adults emerged m September. They were submitted to Dr. McDunnough, 

 Entomological Branch, Ottawa, and determined as Graptolitha laticinerea 

 Grote. Sanders (1) observed in 1913 that the fifth and sixth stage larvae of 

 Graptolitha bethunei G. & R., a closely related species, was predaceous on the 

 pupae of the tent caterpillars (Malacosoma disstria and M. ameritana). 



The egg is dome-shaped and laid singly on the underside of the tips of the 

 outer branches. Manj' of the eggs are deposited at the base of the buds or on 

 bud scales and when in the latter position they often drop to the ground before 

 the larva emerges. Pupation takes place during July from two to four inches 

 below the surface. The pupa is naked, yellowish-brown and three-quarters of an 

 inch in length. The adult is a dull coloured, grayish moth, with inconspicious mark- 

 ings and one and one-quarter inches wide, when the wings are expanded. They 

 are strong fliers and are on the wing for a month in the fall and another month 

 in the spring. According to Slingerland (2) they are, "often found in maple 

 groves while sugaring is going on. Sometimes sap pails are found in the morning, 

 completely covered with moths." 



Remedies, 



According to Slingerland and Crosby (3) they should receive the following 

 treatment. As the green fruit worms are about half grown when they begin 

 feeding on the fruit it is then a very difficult matter to kill them with a poison 

 spray. Earlier when feeding on the buds and newly opened leaves many of the 



1. — Sanders & Dustan, Dom. Can., ept. Agr. ,Ento,m Bui. 17, p. 13. 



2. — Sander.s & Dustan. L.C. p. 8. 



3.' — Slingerland & Crosby, Manual of Fruit Insects.p. 41. 



