30 



NEW YORK STATE MUSEUM 



Treatment: capture the butterflies with nets. Spray young 

 cabbage with poison, older ones with hellebore or pyrethrum 

 water. Dust with lime. 



60 Cabbage thrips (T h r i p s t a b a c i). Cabbage and lettuce 

 frequently show white spots as though blasted, caused by minute 

 yellowish or brown insects. These little creatures ^are scarcely 

 visible to the unaided eye. 



Treatment : spray affected plants at the beginning of the trouble 

 with kerosene emulsion or a soap solution. 



Fig. 52 Rhubarb curculio: a adult beetle; c newly hatched larva; c? fuH -grow larva; e pupa— all 

 about twice natural size (after Chittenden, U. S. dep't agr., div. ent., bull. 23, n, s.) 



61 Rhubarb curculio (L i x u s c o n c a v u s). Wilting rhubarb 

 leaves and punctures in the leaf stems are usually caused by a 

 nearly cylindric, black, extremely "hard shelled" beetle with 

 more or less of a golden bloom on it. The grubs burrow in the 

 stems and leaf stalks of dock as well as of rhubarb. 



Treatment : the beetles can be collected and 

 destroyed by hand whenever injurious. They 

 are abroad in June. 



62 Tarnished plant bug (L y g u s p r a t e n- 

 s i s). Small yellowish and black bugs about 

 1 inch long, frequenting many plants and in- 

 juring most garden crops and some trees. A 

 most serious injury by this pest is the exten- 

 sive blasting of peach buds on nursery stock. i^lr(^L7m^T^ ^'^''' 



