Frankliniella occidentalis colonization on okra- and normal-leaf cotton strains and cultivars
2006
Chen, T.Y. | Chu, C.C. | Henneberry, T.J.
With blue sticky card traps as sampling tools, populations of western flower thrips, Frankliniella occidentalis (Pergande), developing on normal-leaf and okra-leaf upland cotton strains and cultivars, were studied in the field in 2003 and 2004. Five normal-leaf and three okra-leaf strains and cultivars were included in the 2003 studies, and four normal-leaf and four okra-leaf strains and cultivars were studied in 2004. F. occidentalis caught on blue sticky card traps in okra-leaf strain and cultivar plots were significantly greater compared with normal-leaf strain and cultivar plots during both years of the study. Okra-leaf shape and normal-leaf shape sticky card trap studies were conducted in the field to determine if these features contributed to F. occidentalis' preference for okra-leaf cultivars. Significantly more F. occidentalis were caught on the trap edges compared with the interiors of sticky card traps of either shape. Okra-leaf shape sticky card traps with larger perimeters caught more F. occidentalis than normal-leaf shape sticky card traps with smaller perimeters. When okra-leaf cotton strains and cultivars are considered for selection for resistance to B. tabaci or other pests, the possible preference of F. occidentalis for the okra-leaf strains and cultivars should be considered.
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