A New Technology for Improved Pesticide Coverage on Cotton Canopy. Part II: Field Efficacy
Mar 5, 2019
Whitefly (Bemisia argentifolii [Gennadius]), is widespread on cotton in hot, semi-arid areas. Apart from direct yield losses, the honeydew excreta causes stickiness of cotton fibers and enables sooty mould development. Whitefly is also a vector of a number of viral diseases. A major part of its life cycle is as a sessile larva on the underside of leaves. With protectant insecticides, especially those with low vapour pressure, a dense coverage is crucial for whitefly control. A combination of new sprayers and new insecticides of low mammalian toxicity was evaluated against standard sprayers and conventional insecticides for controlling whitefly. This was correlated with improved penetration and spray coverage over the entire plant, including the leaf undersurface, achieved with a drop-tube (vertical boom) air-assisted sprayer to deliver the spray between rows. The predator population was partially affected.