Development and oviposition of flax budworm, Heliothis maritima
2006
Kanehira, O.(Hokkaido. Central Agricultural Experiment Station, Naganuma (Japan)) | Okuyama, S.
The effects of a range of constant temperatures on the development of each stage of flax budworm, Heliothis maritima, were investigated. The eggs were reared under 6 levels of temperatures (13-30 deg C). Succeedingly, the larvae were fed on soybean leaves and the pupae were reared under 4 levels of temperatures (15-30). The duration of each stage decreased as the temperature increased. The developmental zero and effective cumulative temperature were 7.7deg C and 64.7 degree-days for the egg stage, 10.4deg C and 271.9 degree-days for the larval stage, 10.2 deg C and 168.7 degree-days for the pupal stage, respectively. The larval stadium could be estimated by head capsule widths because the range of the head capsule width in each stadium did not overlap each other. The female moth survived for 8 days and began to oviposit 3 days after emergence. The peak of the oviposition occurred 5 days after emergence and the fertility was 687.4. To complete one generation, Heliothis maritima required 505.5 degree-days above 10.1 deg C, developmental zero for all stagees. Also, the annual integareted temperature was estimated to be 1,128 degree-days above 10.1 deg C. In Hokkaido, there can be occurred two generations on the basis of effective cumulative temperature, and this number agree with the actual numbers inferred from light trap catches.
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