INSECTS INJURIOUS TO VEGETATION 



39 



interesting because it was imported from Europe in 1883 for 

 this very purpose and has " made good." 



Other Garden Pests. — Every sort of garden vegetable must 

 struggle against the ravages of its own particular set of insects. 

 Peas and beans are eaten into by the pea weevil (Fig. 21, A) and 

 bean weevil, which cause injuries in this country amounting to 

 several millions of dollars 

 each year ; the striped cu- 

 cumber beetles (Fig. 21, 

 B) attack young cucum- 

 ber and melon plants; the 

 squash bugs (Fig. 21, C) 

 devour our squash vines ; 

 and the celery caterpillar 

 (Fig. 2i, D), the larva of 

 one of our most beautiful 

 swallow-tail butterflies, 

 eats the celery leaves be- 

 fore the stalks are ready 

 for the table. 



Insects Injuring Fruits. 

 — San Jose Scale. — Per- 

 haps the greatest struggle 

 of all against destructive 

 insects must be made by 

 the horticulturists, for no 

 other vegetation seems so 

 liable to attack as the 

 fruit trees and the fruit they bear. The San Jose scale 

 insect (Fig. 22) is perhaps the most important of all fruit- 

 tree pests. It appeared in 1880 near San Jose, California, and 

 from there became distributed over the United States on young 

 trees. The adult female insect is only a fraction of an inch long 

 and lies underneath a small, grayish scale formed by concentric 

 circles and produced by a waxy secretion from the insect. Be- 



Fig. 21. — Insects injurious to garden 

 vegetables: A, pea weevil; B, cucumber 

 beetle ; C, squash bug ; D, celery caterpillar, 

 the larva of the black swallow-tail butterfly. 

 (After various authors.) 



