ダイズ畑におけるイチモンジカメムシの産卵特性と卵期の死亡要因

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  • Seasonal Prevalence and Mortality Factors of Eggs of Piezodorus hybneri GMELIN (Heteroptera: Pentatomidae) in a Soybean Field.
  • ダイズバタケ ニ オケル イチモンジカメムシ ノ サンラン トクセイ ト ラン

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Egg masses laid by Piezodorus hybneri were checked every three days from June to August in 1988-1990 in a soybean field in Kyushu, Japan. The mortality factors of eggs were investigated in 1989 and 1990. Egg masses found in the field were left for 6 days to check hatching 3 and 6 days later. The egg masses were then collected and kept in laboratory until parasitoids emerged. The density of egg masses increased just after soybean plants reached the pod-development stage and egg masses were found until about 45 days after flowering. Females of P. hybneri tended to lay eggs on pods of soybean plants; more than 55% of egg masses were found on pods. The number of eggs per egg mass ranged from 2 to 47 with a mean (±SD) of 20.4±8.4. The most important mortality factor was parasitism by Telenomus triptus. The percentage parasitism was estimated at 91.3% in 1989 and 78.0% in 1990. Percentage parasitism by T. triptus was high regardless of the size of egg mass. Ooencyrtus nezarae was another egg parasitoid emerging from P. hybneri eggs. However, the percentage parasitism was very low below 2.5% in both 1989 and 1990. Eggs often disappeared in the field suggesting another important but unknown mortality factor.

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