الفهرس 
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Abstract
SUMMARY
Toxicological and biological impact of four insecticides
from four different groups, i.e. fenvalerate (syntheticx
pyrethroid), carbosulfan (carbamate), triazophos
(organic phosphate) and Pyriproxy~en ~lnsect Growth Regulator)
were evaluated on the” mole-cricket, !L.. africana, one of
the most important pests on many crops.
Results obtained may be summarized as follows:
1- ~ africana 4th instar n~fiph, in laboratory tests, waS
more sensitive to carbosulfan than other tested compounds;
the descending order of toxicity according to values of
LC50’s was carbosulfan, triazophos, fenvalerate and Pyriproxyfen,
although differences”~eremsignificart.The arrangement
according to LegO was carbo5ulfanm fenvalerate, triazophos
with marginal diflerences, while Pyriproxyfen was
conspicuously less toxic, the change of arrangement of Xhe
three conventional insecticides was mainly brought about by
difference in slope of Ld-P lines.
2- S-71639 and Sumicidin caused reductions of weight of
full-grown nymphs.
3- Pyr-iproxyfen showed a detrimental effect by increasing
significantly pre-oviposition periods and reducing number of
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nests and eggs/female. in a manner in comparable to any
other toxicant tested.
4- Pyriproxyfen and fenvalerate had some latent effect on
the sexual ratio of ~ africana adults.
5- Pyriproxyfen achieved the lowest percent of hatchability
as it varied between 18.1 and 0.0 % according to concentration.
Other tested compounds had slight effects on
hatchability,
6- In field trials, triazophos. fenvalerate and carbosulfan
were almost ’e~ui-toxic in poisonous baits for molecrickets
while Pyriproxyfen was the least effective on molecrickets
in cotton field in terms of rapid evaluation but.
in view of laboratory results would show a great impact on
the next generation.