220 



most severely affected were the lady beetle, Hlppodamia convergens (Guer.); 

 lace-winged flies, Chrysop a spp.; hooded beetles, Notoxus spp.; soft-winged 

 flower beetles, Collops spp.; and scymnus beetles, Scymnus spp. of the new 

 indicator groups added to the study in 1965, syrphid flics, family Syrphidae, 

 order Diptera, and ichneumonid wasps, family Ichneumonidae, order Hyraenoptera, 

 were found to be highly susceptible to ULV Malathion. Spiders, also added in 

 1965, were not seriously depleted. As in 1964, the insects least affected 

 were nabid bugs, Nabid spp.; big-eyed bugs, Geocoris spp.; and assassin bugs, 

 family Reduviidae. Spring and summer populations of the indicator organisms 

 did not appear to be adversely affected. In fact, populations of several of 

 the indicator insects were larger in the control zone, treated in 1964, than 

 outside the control zone where ULV Malathion had not been used. 



425. ; Ashdown, D. and Hills, T. M. 1967. A comparison of the effects of 

 the 1964, 1965 and 1966 High Plains Boll Weevil Control Programs on 

 population trends of non-target arthropods. Tex. Tech. Coll. Entomol. 

 Rep. 67-1, 14 pp. 

 The project for monitoring the High Plains Boll Weevil Control Program was 

 designed to evaluate the effects of aerial application of ULV Malathion on cer- 

 tain non-target, terrestrial insects. Because of the favorable balance of 

 nature" that exists in cotton fields on the High Plains of Texas, special em- 

 phasis was placed on the effect of the control program upon the most important 

 predators of those insects destructive to cotton. Overall results from the 

 three years of this study shov; that the indicator species most adversely 

 affected immediately following the application of ULV Malathion were: lady 

 beetles, Scymnus beetles, hooded beetles, soft-winged flower beetles and 

 lace-winged beetles. Those species whose populations were less seriously 

 depleted by the direct effects of the control program were members of the 

 order Hemiptera and included: nabid bugs, big-eyed bugs and assassin bugs. 



