Dragon fruit, also known as red dragon fruit, fairy honey fruit, lover fruit, etc., belongs to the Cactaceae (Cactaceae) triangular column (Hylocereus) and Xi Shi (Seienicereus) plants. Here is a brief introduction to how to prevent dragon fruit stem blight.
Dragon fruit stem blight
1. Symptoms
Grayish-white irregular lesions are formed on the edge of the plant, with many small black spots on it. The lesions are sunken and gradually dry up, eventually forming gaps or holes, which mostly occur in the middle and lower stem nodes. Pathogen: There are currently three pathogens that can cause the above symptoms, Diplodia sp., Ascochyta sp., Phoma sp.
2. Integrated disease prevention and control
(1) Protect disease-free areas. Strictly control the transfer and introduction of seeds from disease-free areas to disease-free areas, and select and breed disease-free seedlings.
(2) Plant or select disease-resistant and high-quality varieties. It is the most economical and effective measure to control pitaya disease.
(3) Remove diseased branches and field weeds and maintain field hygiene, thereby reducing field disease sources.
(4) Strengthen fertilizer and water management, focusing on avoiding flood irrigation and long-term sprinkler irrigation. Flood irrigation will cause the root system to die due to long-term hypoxia, and sprinkler irrigation will increase the humidity of the orchard, which is conducive to the occurrence of diseases. It is best to use drip irrigation technology, ridge cultivation, and application of decomposed organic Fertilizers increase the application of potassium fertilizers to improve plant disease resistance.
(5) Chemical control: For the control of anthracnose, stem blight and fusarium wilt, Bordeaux mixture, Shibaoke, Shibaogong, thiophanate-methyl, mancozeb, carbendazim, etc. can be used, generally sprayed every 7-10 days Once, a total of 2-3 times. For the prevention and treatment of soft rot, blister scab and canker, copper master, tyrosine copper, agricultural streptomycin, and daisen zinc can be used.
