priciples of insecticide use in rice ipm

Insecticides in Rice IPM (DRR)
GALL MIDGE MANAGEMENT WITH GRANULAR INSECTICIDES
For the management of gall midge, which is endemic in many deltas and certain special areas like Telangana
in A.P, Ranchi area of Bihar, states like Orissa, Goa, and Manipur along with many coastal areas, resistant
varieties are popular. But the problem of biotypes in the insect and lack of other desirable traits like grain
quality in the resistant varieties etc. are the limitations. Hence, farmers have to resort to insecticide
application particularly in late sown and late transplanted situations.
The past results from coordinated trials and lead research have clearly shown that spray formulations are
ineffective against gall midge except chlorpyriphos which is moderately effective at recommended dosage
of 500 g a.i./ha. Among the granular insecticides carbofuran, phorate, chlorpyriphos, isazophos and
quinalphos are moderately good in reducing the silver shoot incidence. It also came to light that cartap
and thiocyclam, which are neiristoxins, have poor potential toxicity to gall midge (Table 2).
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Table 2: Spectrum of toxicity of granular formulations against insect pests of rice
Insecticide Group
Rate
(g a.i./ ha)
Carbofuran CB750 *** ** *** ** *** *** **
Carbosulfan CB1000 ** ** ** ** * *** *** ***
MIPC CB1000 ** * *** ** **
BPMC CB 1000 * * ** ** **
Phorate OP 1250 ** *** ** ** **
Quinalphos OP 1000 *** ***
Fenthion OP 1000 ** ** ** ***
SB GM WM LF RHBPHWBPHGLH
Ethoprop OP 1000 ** * * * * *
Chlorpyriphos OP 1000 ** *** ** * * * *
Isazophos OP 600 *** *** ** *** *** ** ***
Cartap NT 750 *** *** ** ** **
Thiocyclam NT 750 *** *** ** ** ***
Fipronil PP 75 ** *** ** ** ** ** ** **
* Moderately effective ** Effective *** Highly effective
PP: Phenyl pyrazole OP: Organophosphate CB: Carbamate
NT: Neiristoxin SB: Stem borer GM: Gall midge
WM: Whorl maggot LF: Leaf folder RH: Rice hispa
BPH: Brown planthopper WBPH: Whitebacked planthopper GLH: Green leafhopper