Abstract
Experiments to control the southern corn rootworm, Diabrotica undecimpunctata howardi Barber, were carried out in southeastern Virginia during 1962.Sixty-five different formulations of 26 compounds were tested as soil-band treatments at pegging time on Virginia jumbo-type peanuts. Nine compounds: diazinon; Zinophos ( O,O -diethyl O -2-pyrazinyl phosphorothioate); GC-4072 (2-chloro-1-(2,4-dichlorophenyl)vinyl diethyl phosphate); phorate; AC-43064 (2-(diethoxyphosphinothioylimino)- 1,3-dithiolane); Bayer 25141 ( O,O -diethyl O - [p -(methyl- sulfiny1)phenyl] phosphorothioate); Bayer 39007 (o-isopropoxyphenyl methylcarbamate); UC-10854 ( m -isopropylphenyl methyl carbamate); and UC-8305 ( P -chloro-2,4,dioxa-5-methyl P -thiono-3-phosphabicyclo(4.4.0)decane), applied in granular form as soil-band treatments during mid-July effectively controlled a cyclodiene-resistant population of the southern corn rootworm. Emulsifiable concentrate treatments were ineffective. Root-worm control resulted in an increase in yield and in percent of sound mature kernels.
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