Susceptibility of Epilachna varivestis Mulsant (Coleoptera: Coccinellidae) and Pieris brassicae (L.) (Lepidoptera: Pieridae) to methyl bromide fumigation
2006
Ogawa, N.(Japan. Ministry of Agriculture, Forestry and Fisheries, Yokohama. Yokohama Plant Protection Station) | Naito, H. | Tanigawa, N. | Goto, M. | Soma, Y.
Susceptibilities of all developmental stages of the Mexican bean beetle: Epilachna varivestis Mulsant and egg, larva, and pupa of the large white butterfly, Pieris brassicae (L.) to methyl bromide (MB) fumigation were investigated. Fumigation tests were conducted for two hours at 15 deg C in a 29.5 liter fumigation box. The most susceptible stage of E. varivestis was the egg: the least susceptible stage was the pupa. The LDsub(50) and LDsub(95) of the pupa were 24.3 g/cubic m and 31.2 g/cubic m, respectively, and the pupa was completely killed at a dose of 35 g/cubic m. The least susceptible stage of P. brassicae was the pupa, and it was completely killed at a dose of 40 g/cubic m.
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