Abstract

STUDIES ON EFFICIENT CONCENTRATION OF DICROTOPHOS IN CONTROLLING TRIOZA FLETCHERI MINOR INFESTATION IN TERMINALIA ARJUNA

Lakshmi Marepally* and G. Benarjee

Abstract

The leaf gall infections caused by Trioza fletcheri minor are highly virulent with considerable damage in leaf quality. Therefore an attempt has been made to evaluate the efficient concentration of Dicrotophos in controlling the infestation through the studies on total soluble proteins, free amino acids, total soluble sugars, total reducing sugars, secondary metabolites (Starch, Phenols, Phyticacid, Acid detergent fibre, total chlorophyll, chlorophyll–a, chlorophyll- b and carotenoid in Terminalia leaves. Results revealed that total soluble proteins and total soluble sugars were increased in D1 (0.5% dicrotophos treated Terminalia), D2(0.2% dicrotophos treated terminalia) and D3(0.1% dicrotophos treated Terminalia) batches over the healthy control but found decreased over infected control. In comparison with the healthy control, free amino acids and total reducing sugars were decreased in D1, D2 and D3 batches whereas a significant increase was noticed in these batches over the infected control. The starch content and ADF% of infected control found increased significantly followed by D3, D2 with least increase in D1batch. In comparison with the healthy control, the phenol, phytic acid content was reduced drastically in infected control with a least reduction in D1 batch. Photosynthetic pigments like total chlorophyll, chlorophyll–a, chlorophyll– b and carotenoids were decreased significantly in infected control whereas these got reduced at a lower level in D1 batch than D2 and D3 respectively. Based on the results obtained from the present study 0.5% Dicrotophos is found efficient in controlling the infestation.

Keywords: Secondary metabolites, photosynthetic pigments, Triozafletcheriminor, Terminalia arjuna, Dicrotophos.