Field evaluation of ajoene, a constituent of garlic (Allium sativum) and neemazal, a product of neem (Azadirachta indica) for the control of powdery mildew (Erysiphe pisi) of pea (Pisum sativum)

The efficacy of two pi ant products, viz., ajoene, a constituent of garlic (Allium sativum), and neemazal, a product of neem (Azadirachta indica), was evaluated in the field individually and also in combinations during 1995-96 and 1996-97 cropping seasons. Both the products at different concentrations (Neemazal 50, 150, 250 mu g ml(-1); Ajoene 100, 500, 750 pg ml(-1) and their combinations) reduced disease intensity of powdery mildew of peas as compared to control. Yield parameters were largely significant. Combined treatments were not better than the individual applications.