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Methods of infestation of sorghum lines for the evaluation of resistance to the maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)


Methods of infestation of sorghum lines for the evaluation of resistance to the maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae)



Crop Protection 14(7): 561-564



ISSN/ISBN: 0261-2194

DOI: 10.1016/0261-2194(95)00065-8

The effects of age ranges, female density, and oviposition periods on the development of maize weevil (MW), Sitophilus zeamais Motschulsky, were studied on sorghum, Sorghum bicolor L. grain under controlled temperature, R.H. and photoperiod, in order to select a reliable and efficient infestation method for resistance screening of sorghum against MW. Females between 16 and 20 days old had a significantly larger oviposition rate than the other age ranges studied. The total number of MW eggs increased significantly with an increase in the number of seeds, weevil density and oviposition period, but these differences were not reflected on the progeny and kernel weight loss. This response was similar using three or four MW females and 14 or 21 days oviposition. These MW densities and oviposition periods produced significantly more progeny and kernel weight loss than two females ovipositing during 7 days. The percentage damaged grains increased significantly with a decrease in the number of seeds and an increase in the number of weevils and oviposition periods. Infesting 50 grains with three 16-20-day-old females during a 14 day oviposition period appears to give a reliable dense distribution of the insects necessary to rank efficiently the sorghum resistance against MW.

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Accession: 002894220

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