IMPACT OF CERTAIN PLANT EXTRACTS AGAINST MULBERRY LEAF ROLLER DIAPHANIA PULVERULENTALIS

[Text Box:] The present investigation is intended to explore the possibility of using the medicinal plants such as Lantana camara Linn. (lantana), Allium sativum Linn. (garlic), Zingiber officinale Rose. (ginger), Azadirachta indica Juss.(neem) and Vitex negundo Linn. (vitex) having insecticidal properties against the mulberry leaf roller Diaphania pulverulentalis. The outcome of the findings indicated that the mortality of the second instar larvae of leaf roller recorded at each and every concentrations of the plant extracts found to be significant compared to untreated check at 24, 48, 72, 96, 120 and 144 h intervals in both methanol and aqueous extracts. Similarly, the per cent mortality of pupae and moths with deformation recorded maximum at lower concentrations of methanol and aqueous extract of plants compared at higher concentrations. While in case of third instar, the mortality was less compared to second instar. Higher mortality of the larvae was noticed with increase in concentration. After 144 h, the mortality range recorded by the methanol extract of the plants was maximum (85.00 to 95.00%) compared to aqueous extracts (58.00 to 76.00%). Based on the screening, one concentration from each plant extract which was more effective and statistically significant was selected and used to study its residual toxicity on silkworm Bombyx mori L.