Susceptibility of Romanomermis culicivorax (Nematoda: Mermithidae) postparasites to agrichemicals used in Louisiana rice production.
Susceptibility of Romanomermis culicivorax postparasites to riceland agrichemicals was evaluated during 1983. Nematode mortalities for all agrichemicals at 2 days posttreatment ranged from 0 to 11.4% with fentin hydroxide + urea responsible for the highest mortality. Fertilizers were significantly more toxic to nematodes at 2 and 25 days posttreatment than were insecticides. Carbofuran and methyl parathion produced less than 1% mortalities at 2 days and less than 5% mortalities at 25 days posttreatment. Approximately 80-84% of the surviving females exposed to insecticides as postparasites became gravid. Infectivity of the subsequent F1 generation preparasites resulted in greater than 92% parasitism in Culex quinquefasciatus larvae, except those produced by nematodes exposed to carbofuran (76.4%), 2,4-D (70.9%) and fentin hydroxide (67.4%).
Walker
T W
TW
Department of Entomology, Louisiana State University, Baton Rouge 70803.
Meek
C L
CL
Wright
V L
VL
Billodeaux
J S
JS
D000383:Agriculture / Q000379:methods*; D000818:Animals; D003465:Culex / Q000469:parasitology*; D004463:Ecology; D005260:Female; D005308:Fertilizers / Q000633:toxicity*; D008297:Male; D008632:Mermithoidea / Q000187:drug effects*; D012275:Oryza; D010572:Pest Control, Biological / Q000379:methods*; D010575:Pesticides / Q000633:toxicity*
D005308:Fertilizers; D010575:Pesticides