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MISC. PUBLICATION 62 6, TJ. S. DEPT. OF AGRICULTURE 



Figure 109. — Injury to violet leaves by 

 the violet sawfly: a, Egg cells on 

 upper surface of leaf; a\, an egg cell 

 magnified; b, cells after escape of 

 larvae; &i, one of same magnified; 

 c, egg from above; d, egg in situ from 

 side; e, female at rest on leaf;/, newly 

 hatched larvae on leaf; /i, same en- 

 larged; g, active stage of larva; h, full- 

 grown larva feeding, a, b, e, f, g, h, 

 natural size; a h b h c, d, /i, enlarged. 



May and early in June, although it may 

 be found earlier. The larvae have been 

 reported to pupate in the pithy stems 

 of plants, and the adults emerge in 

 about 2 weeks. In some localities sev- 

 eral generations may occur. 



Treatment. — Spray or dust with 

 lead arsenate or derris when the larvae 

 are first observed. When only a few are 

 present, they may be hand picked. 



Other Pests of Pansy 



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Red spiders 11 



Cutworms 2 



Greenhouse leaf tier 5 



Red-banded leaf roller 50 



Yellow woolly bear - 3 



Aphids 9 



Flea beetles 8 



Wireworms 15 



Sowbugs 17 



Slugs 16 



Solanum mealybug (on roots) 63 



PEONY 



Rose Chafer 



The rose chafer (Macrodactylus sub- 

 spinosus (F.)), although an outstanding 

 pest of roses, is equally destructive to 

 the blooms of peony and iris. The 

 beetles eat holes in the flowers and 

 leaves. The blooms of many other 

 plants, including dahlia, foxglove, hol- 

 lyhock, ox-eye daisy, and poppy, are 

 also attacked by this beetle. It is a 

 long-legged, yellowish-brown beetle (fig. 

 110) about Vz inch in length. It often 

 appears rather suddenly in swarms in 

 June or early in July and continues its 

 ravages for a number of weeks. The 

 insect is more abundant in areas having 

 light sandy soil. The larvae feed on 

 the roots of various weeds and grasses 

 and pass the winter in the soil. 



Treatment. — No entirely satisfac- 

 tory remedies are known. Relief may 

 be had by collecting the beetles early 

 in the morning before they become 

 active, or by shaking them into a pail 

 of water covered with a film of kerosene 

 or other oil. Spraying or dusting the 

 beetles with pyrethrum, thoroughly 

 covering them, is of some value. This 

 treatment, however, must be repeated 

 as often as the beetles appear. Spray- 

 ing the plants with lead arsenate, derris, 

 or bordeaux mixture will protect the 

 foliage but usually will not save the 

 flowers. 



Young chickens eat rose chafers 

 readily but are fatally poisoned by 

 relatively small numbers of them. 

 Chickens should, therefore, be re- 

 strained from visiting areas infested 

 with rose chafers. 



Figure 110. — Rose chafer beetles at- 

 tacking chestnut blossoms. About 

 twice natural size. 



