Effect Of Time Of Commencement And Interval Of Spraying Calixin-M On The Control Of Cercospora Leaf Spots And Rust In Groundnut

Abstract

Calixin-M(11%2,6-dimethyl-4tridemorpholine+36% manganese ethylene-bis- dithiocarbamate) was applied to two varieties of groundnut (F452.4 and Samaru 38) to control Cercospora leafspots and rust (Puccinia arachidis). Two different times of commencement of spray (that is, 36 days after sowing at first appearance of symptom) and three interval of spray (that is, 7-, 14, and 21 days) were used. There was no significant difference (P=0.05) in visual disease scores and yield of groundnuts between the two sprays schedules. The disease severity (measured on scale 1-9) decreased as the intervals of spraying decreased while pods and haulm yields increased in the same pattern. There was no significant difference (P=0.05) in disease scores of both leaf spots and rust between plants sprayed weekly and those sprayed forthnightly. These results suggest that the spray schedule for Calixin-M, to control leaf spots and rust in groundnut, is to spray at first appearance of symptoms and at 14-days interval.

Key words: Calixin-M, Cercopora leafspots, rust, control.

Journal of Applied Chemistry and Agricultural Research Vol. 2 1995: pp.15-19