Cold storage of eggs in the predatory bugs Andrallus spinidens (F.) and Arma custos (F.) (Hem.: Pentatomidae)
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
The predatory bugs Andrallus spinidens (F.) and Arma custos (F.) are generalist cosmopolitan predators preying on different sort of defoliator pests found in agricultural and natural ecosystems. Survival and development times of the predators' eggs at different ages (1- to 6-day- old) were investigated under 0- (control), 3-, 6- and 9-day cold storage periods at 9°C, RH = 70% ± 5% and complete darkness. At each egg age four groups of egg batches were prepared. Every egg batch consisted of 10 eggs for A. spinidens and 5 eggs for A. custos. Factorial ANOVA results showed that a combination of the three main factors of predator species, egg age and storage period significantly affected on both egg survival and egg development. Eggs with 6-day cold storage showed an acceptable survival (%55) compared with those of 9-day cold storage (%28). Generally, for both predator the longer storage period the lower percent survival was observed. Higher survival was achieved for 6-day-old eggs (71%). Overall, A. custos relatively demonstrated a better performance by having higher survival (61%) compared with A. spinidens (54%). This may in part reflect their adaptability to the original habitats. In conclusion, short-term cold storage of the predators’ egg should be considered at full-grown embryonic stage.
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