INCREASING THE POTENTIALITY OF THREE PREDACIOUS INSECTS, BY STARVATION | ||||
| Journal of Plant Protection and Pathology | ||||
| Article 19, Volume 28, Issue 3, March 2003, Page 2407-2415 PDF (1.64 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jppp.2003.243283 | ||||
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| Author | ||||
| Laila A. EI-Batran, | ||||
| Econc·mic f.r.~omology Dept., F~::i.ll!y of Agric. MaTl~':;u, •• University | ||||
| Abstract | ||||
| Efficiency of the three larval predacious insects. Coccinella undecimpunctste L. Chi/ocorus bipustulalus L.. and Chrysoperla camea Steph. larvae alonq with adults of the Iwo former coccinellid beetles were estimated after vaned periods 9f starvatic:1 (2. 4. 6. 8, 10. 24, and 26 hours). Starved individuals were reared on Ap < /em>hIs gossyp < /em>ii Glover under laboratory conditions. Results showed that starved larvae as well as adutts of coccinellids were more positively to the preys as compared to t ose without starvation. The successive four larval instars of C. unoecirnpunctete; showed a maximum response after 4h., Sh., 10h., and 26h. of starvation, since he average, numbers of consumed aphids I larvae were 26 S, 60.4. 99.2. and 10S.6 especlively for its successive four larval instars. In case of Ch. bipustulalus, the same periods of starvation (4h .. Sh., 10h., and 2Sh.) gave the maximum response. since he average numbers of consumed aphids I larvae were 24.4, 5S.2, 90.4. and 102.4. respectively. For the successive lour larvallnstars. Results also concerning the average number of consumed aphids for adults of both sexes of coccinellid predators; after varied periods of starvatio ,since the maximum response was detected arter 26 h. of starvation for adults of bolh coccinellids. The consumption of adults were 35.2,55.2 aphids and 31.2, 4S.4 aphids for male and female of C. undecimpunctata and Ch. bipuslulalus, respect; ely. These results showed also that the rate of predation by C. undeclmpunctala was much higher than that of Ch. bipuslulalus in larval stage as well as in adults f r almosl all the same starvation periods. In case of C. camea. the average numbers or consumed aphids at the starvation periods S, S, and 10h, were 16.4, 47.S and 99.2 I larvae for its three successive larval instars. | ||||
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