The leaf roller is a member of the family Lepidoptera, Pyralidae. It is found mainly in China, Japan, Korea, Vietnam, Myanmar, Sri Lanka, Pakistan, India, Australia and other countries.
The larvae of the rice leaf roller form Insect buds by spitting out silk and curling the leaves longitudinally. The larvae hide in the bracts and feed on the upper epidermis and leaf flesh tissues, leaving the epidermis behind and forming white strips, which affect the height of the plant and heading, lowering the thousand grain weight and increasing the rate of empty shells, resulting in serious yield reduction.
Characteristics of the occurrence of the longitudinal leaf borer in recent years
In China alone, the annual area of occurrence is more than 300 million mu. It is characterized by
1. Large occurrence and serious damage.
2. The number of peaks has increased and the main migration peak has been advanced.
3. The occurrence range is expanded and the area is increased.
4. Serious overlap of generations in the field, with extended damage time.
5. Severe drug resistance, conventional insecticides can not achieve the desired effect.
How to control rice leaf roller
The best time for control is from the larval hatching stage to the low larval stage.
Fertilize reasonably and strengthen field management to promote healthy rice growth to reduce damage.
Reasonably use sex hormone attractant to reduce the insect population base.
Chemical control
Pesticide selection: choose agents with good penetration, great internal absorption and conductivity and remarkable fumigation. Such as Chlorantraniliprole, emamectin benzoate, indoxacarb, chlorfenapyr and their mixture.
