Latent effect of certain insect growth regulators on body weights of carniolan honeybee workers Apis mellifera L. (Hym., Apidae)
1990
El-Din, H.A.S. (Menoufia Univ., Shebin El-Kom (Egypt). Fac. of Agriculture. Plant Protection Dept.) | El-Samni, M.A. | Attia, M.B.
Three effects of certain insect growth regulators were applied topically on the 3-day old larvae of carniolan honeybee workers in their own cells. The high and intermediate lethal doses (Ld(90) and LD(50)) from each of three tested IGR's (Triflumuron, Chlorfluazuron and Diflubenzuron) had a 'Removal-lethal' effect on treated larvae. Thus, neither sealed brood nor adult workers were obtained from IGR's - treated-larvae. While latent inhibitory action of the lower lethal dose (LD(25)) of all tested IGR's showing a remarkable significant decrease in body weights of newly emerged workers, resulting from IGR's-treated-larvae. The difference between the effect of tested IGR's could be arranged in descending order according to their reducing effect on workers weights as follows: Triflumuron, Chlorfuozuron and diflubenzuron
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