Biological, histological and physiological effect of some insect growth regulators on the greasy cutworm, Agrotis Ipsilon (HUFN.)(Lepidopte:Noctuidae)
Abstract: The insecticidal, biological and morphogenetic effects of four insect growth regulators, IKI-7899, flufenoxuron, S -71624 and S-71639 as well as the effect of the two most active compounds (IKI-7899 and flufenoxuron) on the histology and on the total protein, carbohydrate and 11pid contents of the ovaries of Agrotis ipsilon treated as 4th instar larvae with LC50S of these IGRs were studied.
IKI-7899 and flufenoxuron were the most toxic compounds against the larvae. The order of toxicity in a descending order was IKI-7899 > flulenoxu¬ron > S-71624 > S-71639, with LCs0s of 1, -L68- 45 and 195 ppm, respectively. The percentage of larval mortality increased with increasing tile concentrations.
The four insect growth regulators tested significantly increased (PIKI-7899 and flufenoxuron displayed more pronounced effects on the different biological parameters measured than S-71624 and S-71639.
The four insect growth regulators exhibited larval, pupal and adult deformities, as well as larval-pupal intermediates. More morphogenetic effi¬ciency and scores were obtained in case of IKI-7899 and flufenoxuron than in case of 5-71624 and 5-71639.

The most lost active IGRs (IK1-.7899 and flufenoxuron) significantly decreased the mean length of the ovarioles of females. Moreover, these two compounds, particularly IKI-7899, showed considerable histological alterations in the ovarioles including deformities in the nurse cells, vacuolization of the oocyte and degeneration of the follicular epithelium in
many parts.
The rate of biosynthesis of total protein, carbohydrate and lipid con¬tents of the ovarioles of female treated with IKI-7899 and flufenoxuron de¬creased during the oviposition period, as compared to norma! females. This effect was more pronounced in case of I7

The present study also showed that suppression of the reproductive potential of female moths treated with IKI-7899 and flufenoxuron may be attributed partially to interference of these two compounds with oogenesis and vitellogenesis processes.
Publication year 1996
Availability location معهد بحوث وقاية النباتات - 7شارع نادى الصيد - الدقى - الجيزة.
Availability number
Organization Name
Country Egypt
Publisher Name: قسم علم الحشرات -كلية العلوم - جامعة القاهرة
Place: القاهرة
Author(s) from ARC
Agris Categories Animal diseases
AGROVOC
TERMS		 Agrotis ipsilon. Biological control agents. Carbohydrates. Flufenoxuron. Insect growth regulators. Lipid content. Ovaries. Physiological regulation.
Publication Type Master Thesis
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