Influence of spraying systems on the efficacy of Bacillus thurigiensis berliner against the diamondback moth Plutella xylostella (L.) on cauliflower

A field trial was carried out to study the influence of both high volume and low volume spraying systems on the efficacy of Bacillus thuringiensis against the diamondback moth on cauliflower (var. Krishna-Double cross). Application of Bacillus thuringiensis (Delfin) @ 750 g/ha with a hand-operated Aspee back-pack hydraulic sprayer was significantly more effective than the mist blower application in reducing the larval population and increasing the yield. Similar results were obtained with regard to qUinalphos @ 450g a.i./ha treatment.