Management of powdery mildew (Erysiphe cichoracearum) of okra by using low profile chemicals

Abstract

Okra (Abelmoschus esculentus (L.) Moench is one of the most popular vegetable belonging to the family Malvaceae and has its special place in Indian food habit. The field experiment was carried out to study the efficacy of different low profile chemicals against powdery mildew (Erysiphe cichoracearum) of okra in Randomized Block Design (RBD) with nine treatments (Seven low profile chemicals, one standard check and one control) and three replications were adopted. The disease management studies showed that all the low profile chemicals evaluated in field condition against powdery mildew significantly reduced disease intensity over water sprayed control. Chlorine dioxide @ 0.2 per cent gave significant reduction in powdery mildew disease incidence on okra with PDI in the range of (6.90 to 21.27%) and maximum disease control (PDC) about 59.09 to 66.43 per cent followed by hexaconazole (0.1%) and Ampelomyces quisqualis (0.3%). Chlorine dioxide (0.2%) gave significantly highest yield (22.65 t/ha) in comparison to check (14.39 t/ha). Minimum infection rate ‘r’ of 0.29 and lowest AUDPC value (410.7) were observed in chlorine dioxide (0.2%).