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insecticides against cotton aphid, Aphis gossypii treatments did not vary significantly. The
Glover (Homoptera: Aphididae). Bang. J. Life. minimum number of natural enemies was recorded
Sci., 2008, 20 (1), 69-74. in T 2 and T 4 treatments respectively while the
maximum number of those was found In the
Cotton fields infested with cotton aphid, Aphis treatment T 5. In T 5 maximum number of insect
gossypii Glover (Homoptera : Aphididae) were pests and natural enemies in was obtained. In
treated with Phorate 10 G, Oxydemeton-melhyl 25 maximum cases, the mean number of insect pests
EC. Endosulfan 35 EC, Dimethoate 30 EC mid and natural enemies insecticide spray and control
th
Malahion 50 EC. On The 10 day all the aphids treatment were not different. The least value was
disappeared excepting Dimethoate 30 EC and observed in insecticide + LCC treatment compared
Malathion 5OEC treated fields. The efficacy of to other treatments. The application of Rajdhan +
insecticides against cotton aphid was assessed. LCC (T 2) followed by Rajfuran + LCC (T 4) gave
better performance compared to application of
366 KHAN, M.M.H. (Dept. of Entomology, insecticides alone and control treatment.
Patuakhali Science and Technology University,
Patuakhali). EFFECT OF DIFFERENT 367 MAHFUZ, I. (Dept. of Zoology, Crop
MANAGEMENT STRATEGIES ON THE Protection and Toxicology Lab., Rajshahi
ABUNDANCE OF INSECT PESTS AND University, Rajshahi) & KHANAM, L.A.M.
NATURAL ENEMIES IN T. AMAN RICE. Bang. (BCSIR Laborotaries, Rajshahi). TOXICITY OF
J. Zool., 2008, 36 (1), 85-91. SOME INDIGENOUS PLANT EXTRACTS
Comparative effectiveness of different AGAINST TRIBOLIUM CONFUSUM DUVAL. J.
management strategies on abundance of insect Bio-Sci., 2007, 15, 133-138.
pests and their natural enemies was evaluated in a
T. Aman rice field from July 2004 to January The efficacy of seven different plant extracts viz.
2005. Among nine species of insect pests, the Acorus calamus rhizome, leaves of Datura
number of short horned grasshoppers, green fastuosa, Datura stramonium and seeds of D.
leafhoppers, rice bugs and leaf rollers varied stramonium, Corchorus capsularis, Aphanamixis
significantly among different treatments. No polystachea and Jatropha curcas on Tribolium
significant variation was observed on the number confusum adult was studied. Dose mortality
of long horned grasshopper, yellow stem borer, experiments were conducted with three solvent
rice hispa, gall midge and brown plant hopper (petroleum ether, acetone and methanol) extracts
among different treatments. The lowest abundance separately but J. curcas seed was tested with
of insect pests was observed in the treatment T 2 petroleum ether extract only. Among three
and T 4 respectively and the highest abundance of solvents, petroleum ether extract exhibited piquant
insect pests was found in the treatment T 5 for all toxic effect against the beetle at all the intervals
kinds of observed pest species. Among nine although D. fastuosa leaf produces no mortality at
species of natural enemies, the abundance of the 24 hours of treatment. Acetone extract of A.
populations of carabid beetle, ground beetle, long calamus rhizome, D. fastuosa leaf, D. stramonium
jawed spider, lynx spider among different seed and C. capsularis seed produced mortality at
treatments varied significantly. The abundance of all the intervals but D. stramonium leaf and A.
the populations of tiger beetle, damselfly, lady bird polystachea seed did not show any toxic effect.
beetle, wolf spider and wasp among different
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