INSECTS INJURIOUS TO FRUITS. 83 



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 as 

 in the case of the Tent Caterpillar. 



Leaf Lice or 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 tend-er 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 

 ffi^ on the branches of apple, plum and other 



! ^a trees in autumn. They are yellowish in 



^jH l^^v color when first laid, but become a glossy 



^^HnflK^ black by winter. These hatch in the spring 

 ^K and locate themselves on the small, young 



Wg| HV growth and feed by sucking sap. All hatch- 

 ^L ed at this time are females and reach ma- 

 turity in ten or twelve days, when they com- 

 l^L mence to give birth to living young, pro- 

 ^S&ljfr ducing about two daily for two or three 

 ^^f weeks, when they die. The young ones 

 soon commence to produce live young and 

 & their increase is very rapid, in fact so fast 



j&K ^p that the new growth is kept covered with 



^pVf them. As the season advances, some of 



F j g 29 Eggs the lice acquire wings and found new colo- 



of Plant Lice n ies on other trees. On the approach of 

 young apple cold weather males appear and the season 

 tree - 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 



