INSECTS INJURIOUS TO FRUITS. 



53 



Fall Web Worm (Hyphantria cunea). This is often mis- 

 taken for the Tent Caterpillar from which it is quite distinct. 

 It appears later in the season, generally in July or later. Its 

 webs are larger and loose or open and the caterpillars stay in 

 them and feed. The web is extended to include other foliage 

 as that enclosed is eaten. The remedies should be the same aa 

 in the case of the Tent Caterpillar. 



Leaf Lice OP Aphis (Aphis mali). The leaves of the apple 

 are frequently attacked by plant lice which, by sucking the 

 sap, cause the leaves to curl up and assume a very unnatural 

 appearance. They work almost entirely on the lower side of 

 the leaf and are most abundant on the new and tender growth 

 which generally becomes distorted as a result of such attacks. 

 Similar lice attack the foliage of the plum, 

 currant and other plants. The eggs are laid 

 on the branches of apple, plum and other 

 trees in autumn. They are yellowish in 

 color when first laid, but become a glossy 

 black by winter. These hatch in the spring 

 and locate themselves on the small, young 

 growth and feed by sucking sap. All hatch- 

 ed at this time are females and reach ma- 

 turity in ten or twelve days, when they com- 

 mence to give birth to living young, pro- 

 ducing about two daily for two or three 

 weeks, when they die. The young ones 

 soon commence to produce live young and 

 their increase is very rapid, in fact so fast 

 that the new growth is kept covered with 

 them. As the season advances, some of 

 the lice acquire wings and found new colo- 

 nies on other trees. On the approach of 

 cold weather males appear and the season 

 closes with a stock of eggs for the con- 

 tinuation of the species. 



Remedies. The lice should be destroyed In the spring be- 

 fore they become numerous. The eggs hatch about the time the 

 buds are bursting, and as soon as the lice appear, they should 



Fig. 15. Eggs 

 of Plant Lice 

 on twig of 

 young apple 

 tree. 



