Curly topCaused by: Beet curly top virus (BCTV)
Problem Category: Viral disease
Symptoms: Young plants are usually killed by the virus; older plants are stunted and turn yellow to bronze in color with purple-tinged leaves; leave become thickened and roll upwards; leaf petioles roll downwards; green fruit turns red regardless of its age and becomes dull in color and wrinkled; plants do not recover form the disease and will not flower of produce fruit after infection.
Comments: Virus is transmitted by beet leafhoppers; Insect transmit the disease between over 300 species of plant, including beets, tomato, squash, swiss chard, cucumber and melon.
Management: There is no resistance to Beet curly top virus in tomato so control relies on the management of the leafhopper vector; dense stands of tomato may discourage leafhoppers from visiting the plants ; in areas where the virus is a chronic problem, n areas where curly top is chronic, dense plant spacing, shading, row covers, and intercropping have been reported to reduce levels of infection.
Control: spray 2 times 10% Cowdung+Asafoetida solution in 10 days interval.