Control methods of Diseases and insect pests of Apocynum venetum

Apocynum venetum, also known as kenaf, tea flowers, red willow, etc., erect semi-shrub, 1.5-3 meters high, generally about 2 meters high, up to 4 meters, growing in the sand texture of river banks, ravines and hillsides. Apocynum venetum is distributed in all provinces (autonomous regions) north of the Huaihe River, Qinling Mountains and Kunlun Mountains in China. It can treat heart disease and so on. Apocynum venetum seldom occurs diseases during the growth period. The main disease is spot blight. If spot blight is found during the growth period, it should be prevented immediately with 50% trimethoprim 600 × 800 times, and if you need to apply again, the interval should be 7-10 days. It is necessary to remove diseased plants in time, do a good job in clearing the garden during harvest, and concentrate on destroying diseased plants in order to reduce the source of infection.