196 DESTRUCTIVE INSECTS. 



be less liable to attack. Deterrent washes have not been very 

 successful; probably applications of kerosene-water, tar, or 

 crude petroleum would be as helpful as anything. 



The Cherry Aphis (Myzus cerasi] is a blackish plant-louse 

 which often appears on the leaves of cherry-trees in immense 

 numbers, causing the leaves to curl badly. It often checks 

 the growth of the trees, and is sometimes a serious pest in 

 nurseries. It winters over on the twigs as minute black eggs. 



" Lady-bugs " and other enemies often aid materially in 

 checking its injuries. It will succumb to the same remedial 

 measures as the apple-aphis; it is important to spray early 

 in the season before the leaves are so badly curled that one 

 cannot readily hit the lice. 



The Cherry Fruit-fly or Maggot (Rhagoletis cingulata) is a 

 new fruit pest which has recently appeared in the cherry 

 orchards of New York and neighboring States. It is closely 

 allied to the apple maggot, and has a similar life-history. It 

 has ruined from one-third to one-half of the crop in some 

 orchards. It will prove a very difficult pest to control, for in- 

 fested fruits do not drop from the tree, nor do they show any 

 external evidences of their being inhabited by a maggot until 

 they are overripe. Cherry-growers should be on the lookout 

 for this new enemy. No successful remedial measure has 

 yet been found. 



The Quince Curculio (Conotrachelus cratagi}, as its name in- 

 dicates, is a near relative of the plum curculio. It is the 

 cause of most " wormy " and " knotty " quinces, and often mars 

 or nearly ruins much of the crop. The beetle resembles the 

 plum curculio, except it is broader just back of the head, and 

 has no humps in its back. It lays its egg in a pit in the 

 flesh and makes no crescent slit, and it also differs much in 

 its life-history, as it winters in the grub stage in the soil. 



This quince pest can best be controlled by the jarring 

 method, as described for the plum curculio. As quince trees 

 are usually branched much lower than plum trees, it will be 

 nceesary to use lower " curculio-catchers " in collecting quince 

 curculio. 



The Grape Phylloxera (Phylloxera vastatrix) is a small plant- 

 louse, one form of which works on the roots, causing excres- 

 cences on the smaller roots, and eventually killing suscepti- 



