Evaluation of screening methodologies for resistance to sweet potato weevil, Cylas formicarius Fabr. (Coleoptera: Curculionidae). Working Paper No. 90-12
1990
Amalin, D.M. | Vander Zaag, P.
This research was conducted to determine the best screening methodology for evaluating resistance to Cylas formicarius for sweet potato storage roots. Three different media: no soil, dry soil, and wet soil were evaluated with four cultivars of sweet potato. There was a significant difference in weevil infestation among the different treatments. Higher weevil counts and damage were recorded in the no soil technique and least in the wet soil treatment. The reaction of the different cultivars to weevil attack was also significantly different. The cultivar performance could be ranked as follows: Sinuksuk=MiracleBureauVSP-5. There was no cultivar by technique interaction in the overall weevil rating, indicating that reliable estimates can be obtained with any technique. The no soil and dry soil techniques are the better alternatives for screening for resistance to the weevil, as the level of infestation was higher permitting a greater range in damage to be detected.
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