Journal of Economic Entomology (1999) 92, 1198-1205

Frank H. Arthur (1999)
Knockdown, mortality, and progeny production of lesser grain borers (Coleoptera : Bostrichidae) and rice weevils (Coleoptera : Curculionidae) exposed for short intervals on wheat treated with cyfluthrin
Journal of Economic Entomology 92 (5), 1198-1205
Abstract: Adult lesser grain borers, Rhyzopertha dominica (F.), and adult rice weevils, Sitophilus oryzae (L.), were exposed at bimonthly intervals for 2, 4, 8, and 24 h on wheat treated with 0, 1, 2, and 4 ppm cyfluthrin EC, then removed and held for 2 wk on untreated wheat. The percentage of lesser grain borers that were knocked down after they were exposed increased as exposure interval and concentration increased, and was usually >90% at intervals >4 h for 8 mo after the wheat was treated. Mortality after 2 wk on untreated wheat generally decreased as residues aged, with no difference in mortality among exposure intervals. F₁ production of lesser grain borers was low in untreated controls, so effect of exposure could not be determined. The percentage of rice weevils that were knocked down after exposure also increased as exposure interval and concentration increased; however, except for month 0, mortality after 2 wk on untreated wheat was usually <25% for all bioassays on wheat treated with 1 and 2 ppm cyfluthrin. Although the number of F₁ rice weevils was dependent on initial exposure interval and concentration, the exposure intervals were not sufficient to prevent oviposition. Progeny production also increased as the residues aged. Results of this study indicate that lesser grain borers and rice weevils will survive if exposed for 24 h or less on wheat treated with cyfluthrin EC.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Frank H. Arthur

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sitophilus oryzae	Stored grain
	Rhyzopertha dominica	Stored grain