Biology of Piezodorus guildinii:1 Oviposition, Development Time, Adult Sex Ratio, and Longevity3

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Abstract
The mean number of eggs per mass from 500 egg masses of Piczodorus guildinii (Westwood) (Hemiptera: Pentatomidae), a serious pest of soybeans in southern Brazil, was 15.1. The pods were the main oviposition site. In greenhouse experiments, the mean number of egg masses laid per female was 3.1 during the summer. During winter only 1 of 9 females oviposited, with an average of 8.0 eggs per mass. Oviposition began an average 22.6 (16-65) days after the females became adults. The maximum number of egg masses per female was 9. No relationship was observed between the number of eggs laid and the amount of time spent with the male. Eggs of P. guildinii reared in the laboratory at 24±2°C and 80±2% RH took a mean of 7.5 days from oviposition to hatching, and 4.3, 5.9, 5.5, 6.1, and 9.7 days for the 1st through 5th stadia, respectively. Highest mortality occurred during the 2nd stadium. The time from oviposition to adult averaged 39.0 days. Mean longevity of females and males was 41.2 and 34.0 days, respectively, between December and February, and 96.6 and 112.5 days between April and November. The ratio of P. guildinii observed in the field in Ponta Grossa, Paraná, and reared in cages in a greenhouse in Curitiba, was 1.4 ♀ to 1 ♂.
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