OVICIDAL ACTIVITY OF NATURAL AND SYNTHETIC COMPOUNDS AGAINST COTTON LEAF-WORM
FATMA EL-ZAHRAA ffiRAHIM EL-SWEERKI;
Abstract
V.SUMMARY
Data recorded throughout this study demonstrate the response of the eggs of the cotton leafworm, Spodoptera littoralis (Boisd.) to the effect of eight compounds related to different insecticidal groups, i.e. (pyriproxyfen, flufenoxuron, Vertimec, Bioneem, Nat-!, Garlic-gard, cyanophos and deltamethrin. The indirect effects of some of these compounds on egg were also studied as a result of adult oviposition sites and feeding solution treatments. On the other hand, biochemical analysis were also used in order to throw light on the effect of some of these agents on the embryogenesis, the total soluble protein and certain enzyme activities of the treated eggs.
The obtained results could be summarized as follows :
PART L- Relative susceptibility of different egg developmental ages of S. littoralis to some biological, botanical and chemical insecticides :
The LCso values representing the ovicidal effect against the cotton leafworm one-day & three-day- old egg-masses revealed the following:
1- Flufenoxuron were more potent as an ovicide than pyriproxyfen on both developmental ages of S. littoralis eggs where the LCso values are (133.3 & 17.8 ppm) for pyriproxyfen and (1.4 & 0. 7 ppm) for flufenoxuron at one- & three-day-old eggs, respectively. The three-days old eggs were more susceptible to toxic action of both compounds than the one-day-old eggs.
2- The LCso values ofVertin1ec were 73.2 & 188.82 ppm at the two tested ages, respectively.
3- Concerning the botanical insecticides, the three tested extracts could be arranged according to ovicidal activity on one-day old eggs as follows : Bioneem, Nat-1 and garlic-gard depending on both LCso & LC90 levels. As for the older eggs (three-days-old
. eggs), another arrangement was observed, e.g., Bioneem, Garlic-
Data recorded throughout this study demonstrate the response of the eggs of the cotton leafworm, Spodoptera littoralis (Boisd.) to the effect of eight compounds related to different insecticidal groups, i.e. (pyriproxyfen, flufenoxuron, Vertimec, Bioneem, Nat-!, Garlic-gard, cyanophos and deltamethrin. The indirect effects of some of these compounds on egg were also studied as a result of adult oviposition sites and feeding solution treatments. On the other hand, biochemical analysis were also used in order to throw light on the effect of some of these agents on the embryogenesis, the total soluble protein and certain enzyme activities of the treated eggs.
The obtained results could be summarized as follows :
PART L- Relative susceptibility of different egg developmental ages of S. littoralis to some biological, botanical and chemical insecticides :
The LCso values representing the ovicidal effect against the cotton leafworm one-day & three-day- old egg-masses revealed the following:
1- Flufenoxuron were more potent as an ovicide than pyriproxyfen on both developmental ages of S. littoralis eggs where the LCso values are (133.3 & 17.8 ppm) for pyriproxyfen and (1.4 & 0. 7 ppm) for flufenoxuron at one- & three-day-old eggs, respectively. The three-days old eggs were more susceptible to toxic action of both compounds than the one-day-old eggs.
2- The LCso values ofVertin1ec were 73.2 & 188.82 ppm at the two tested ages, respectively.
3- Concerning the botanical insecticides, the three tested extracts could be arranged according to ovicidal activity on one-day old eggs as follows : Bioneem, Nat-1 and garlic-gard depending on both LCso & LC90 levels. As for the older eggs (three-days-old
. eggs), another arrangement was observed, e.g., Bioneem, Garlic-
Other data
| Title | OVICIDAL ACTIVITY OF NATURAL AND SYNTHETIC COMPOUNDS AGAINST COTTON LEAF-WORM | Other Titles | نشاط بعض المركبات الطبيعيه والمخلقه كمبيدات ضد بيض دودة ورق القطن | Authors | FATMA EL-ZAHRAA ffiRAHIM EL-SWEERKI | Issue Date | 2003 |
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