Biology and abundance of the striped flea beetle, Phyllotreta striolata (F.) Coleoptera: Chrysomelidae on Pak Choi, (Brassica campestris var. Chinensis (L.)
2005
Patricio, M.G. | Ocampo, V.R. | Cadapan, E.P., Central Luzon State Univ., Science City of Munoz, Nueva Ecija (Philippines); Philippines Univ. Los Banos, College, Laguna (Philippines)
The biology of striped flea beetle, Phyllotreta striolata, was studied on detached pak choi leaves in the laboratory and on potted plants in the net house. Total developmental period was 18.35 plus or minus 0.25 days on detached leaves and 25.86 plus or minus 4.44 days on potted plants. Adult longevity was 39.68 plus or minus 14.02 days for male and 36.56 plus or minus 11.53 days for female. The mean fecundity was 619.08 plus or minus 148.60 eggs/female. The sex ratio (male:female) was 0.90:1. Of the seven Brassicaceae species evaluated, pak choi, Brassica campestris var chinensis (L.), and Indian mustard, Brassica juncea (L.), were the most preferred host plants followed by Chinese cabbage, B. pekinensis (Lour.). The least preferred was Chinese kale, B. oleracea (L.). Among the pak choi cultivars, Blak Behi had the highest damage rating while Ching-chang and Psai-Tsai had the lowest. Two cleome weed species (C. viscose and C. rudisperma), of family Capparidaceae, were likewise fed upon by P. striolata. Adults of P. striolata although present year round, were most abundant in March. Temperature and rainfall affected their abundance in the field. Lower population to almost nil, occurred during the wet months but higher population was present during the warm months.
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