Study some bioecological aspects of Clitostethus arcuatus (Rossi) (Col.: Coccinellidae) on greenhouse whitefly Trialeurodes vaporariorum (Hem.: Aleyrodidae)
2010
Yazdani, M. | Zarabi, M.
Clitostethus arcuatus (Rossi) is one of the most important predator of whiteflies which is widely distributed in the world. In this study biology and its feeding rate from different life stages of Greenhouse whitefly colonies which established on tobacco leavs and affect of different diets (Greenhouse whitefly, Ash whitefly, eggs of Sitotroga cerealell (Lep.: Gelechiidae) and artificial diets) on some biological aspects of C. arcuatus, were studied at 25±2ºC, 65±5% RH and a 16-8 h photoperiod. Results showed that matured adults appeared in late April on Ash trees, in the field conditions in Kerman province They had both hibernation and aestivation with two population picks in August and November. Feeding of this ladybird on Aleyrodes singularis is reported in this research for the first time. The result of feeding rate showed that: Female, male and one pair of ladybirds respectively consumed an average of 61.4±0.7, 27.62±0.92, 104.51±0.6 egg; 17.2±0.4, 10.5±0.8, 23.1±0.5 nymph; 28.5±0.9, 20.3±0.6, 47.2±0.6 pupa and 8±0.3, 6.5±0.54, 13.6±0.4 adults (prey/day) on tobacco. It showed significant differences between whitefly life stages as prey and sexes at level of 5%. The larvae consumed an average of 992.2±36 eggs of Greenhouse whitefly during the total larval developmental period. Adult and larvae didnt feed on S. cerealella eggs. Adult longevity and female fecundity showed significant differences on different diets. It showed a good longevity for adults on artificial diet The sex ratio of individuals surviving to the adult stage in different diets was not significantly different (Female/Male=1).
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