No abstract

The studies on bio-efficacy of aphid population showed quite promising results and from the pooled data at first spray, the results revealed that all the treatments proved their superiority over untreated control showing imidacloprid 70WG as the most effective treatment followed by thiamethoxam 25 WG, fipronil 5SC and diafenthiuron 50WP. The second spray results showed that thiamethoxam 25WG, imidacloprid 70WG and fipronil 5SC proved to be the best treatments with maximum reduction of population and were found at par with each other.

No abstract

On summer okra crop seasonal incidence as influenced by weather parameters on mites population reached its peak during last week of April with 8.40 mites in 6.25cm 2 leaf area/ 3 leaves. The correlation between mite population was positively significant against maximum temperature (r= 0.841**), minimum temperature (r= 0.805**), evaporation (r= 0.803**), wind velocity (r= 0.728**) and bright sunshine hours (r= 0.649*), while with morning R.H (r=-0.717**) and evening R.H (r=-0.643*) it was negatively significant. The equations of linear and multiple regression were set of mite population by working out regression coefficient (b) and constant (a) alongwith coefficient of determination (R 2

lambda cyhalothrin 5 EC @ 1ml/l recorded the higher incremental cost benefit ratio of 1:40.9 and 1:36.4, respectively.

The bio-efficacy results obtained after first spray, from the pooled data with respect to effect of different treatments against mite infestation revealed that propargite @ 1500ml a.i./ha proved to be the best treatment showing maximum reduction of mites in 6.25cm 2 leaf area/ 3 leaves followed by fenazaquin, spiromecifen and dicofol which were also highly effective against mites indicating results at par with the best treatment in reducing mite population on okra while during second spray fenazaquin was the best pesticide followed by propargite, spiromesifen, dicofol, diafenthiuron and chlorfenapyr which were highly effective and at par with the best treatment against mites.