EFFICACY OF NEW CHEMICAL PII 122 4% G (THIOCYCLAM HYDROGEN OXALATE 4G) IN MANAGING RICE PESTS

Abstract

The major production constraint of rice in enhancing productivity is due to attack by pests. Rice
stem borer and leaf folder are considered as economic pests and influence the yield if proper
timely management practices are not adopted. In case of severe pest incidences the usage of
insecticides is inevitable. A single insecticide application may control various pest species and
usually forms a persistent residue that continues to kill insects for more days after application.
Many farmers are adopting combination chemicals in order to manage the various pests attack at
one instance. But, regular usage of chemicals with same mode of action and in compatible
insecticidal combinations may lead to pest resistance, resurgence and residual effect. Granular
formulations do not blow or drift and are considered relatively safe from the standpoint of
accidental human exposure. Hence, alternate chemicals in form of granular formulations which
can target major pests with no phtyotoxicity on crops are required. Hence, studies on efficacy
pertaining to PII 122 4% G at different concentrations along with check chemicals viz., cartap
hydrochloride 4 G, fipronil 0.3 G and untreated control were evaluate at Agricultural Research
Station, Garikapadu during rabi 2017-18 to assess the efficacy of various test chemicals against
stem borer and leaf folder infesting rice. The experimental trial was laid out with eight treatments
that were replicated thrice and two spraying were imposed during the entire crop period at
tillering at panicle initiation stage. The data on per cent leaf folder damaged leaves before and at
7, 14, 21 and 28 days after application and % Dead hearts before and at 10, 20, 30 and 40 days
after application and % White ears before harvest were recorded. The data was pooled and were
analysed using SPSS statistical package. The results revealed that, the treatment T7 (university
standard) and T3 (PII 122 4% G @ 500g a.i./ha) was found effective in suppressing the leaf folder
and stem borer in terms of dead hearts and white ears. T5 was also found effective in suppressing
the stemborer infestation and is found on par with the efficacy of test chemical T7 and T3. Hence,
it can be concluded that PII 122 4% G @ 500g a.i./ha is effective against stem borer and leaf