Chemical Control of Tomato Leaf Roll Disease

Physiological leaf rolling control measures are timely watering and fertilization after fruit setting, and covering the sunshade net, covering it in sunny days, uncovering it at night, and not covering in cloudy days. The symptoms of tea yellow mites are narrowing, stiff, erect, wrinkled or twisted leaves, and finally bald tip. The control agent can be sprayed with 1.8% chlorhexidine 3000 times solution. When phytohormone is used to control flower and fruit drop, the leaf or growth point will bend, and the new leaf can not expand normally. The control measure is to select the appropriate concentration when using, generally using the concentration of 15-20 mg / kg. The concentration is lower when the temperature is high. When using, pay attention to prevent the liquid medicine from dipping on the tender leaves or growing points, and never spray it.