What are the control measures for papaya collar rot?
When papaya shows varying degrees of head rot, and even lodging and plant death, it is likely that stem base rot has occurred; high temperatures, frequent rain and humidity make the disease more likely. Control: generally use agents targeting root rot and blight of cucurbits and vegetables, or bacterial agents. If diseased plants are found, pull back the soil around the neck of the diseased plant, and use a sterilized bamboo strip...
When papaya shows varying degrees of head rot, and even lodging and plant death, it is likely that stem base rot has occurred; high temperatures, frequent rain and humidity make the disease more likely.
Control: generally use agents targeting root rot and blight of cucurbits and vegetables, or bacterial agents. If diseased plants are found, pull back the soil around the neck of the diseased plant, use a sterilized bamboo strip or small knife to scrape away the affected cortex and tissue, then apply one of the following formulations to the diseased part and drench the roots, until the wound dries and no longer exudes gum. First: Ridomil + ethylicin; second: Shadufan + agricultural streptomycin (or thiazole zinc), each at 50-100 times dilution; severely affected papaya orchards should be sprayed once every 5-7 days, for 2-3 consecutive times. Plants that have recovered their vigor after treatment are prone to breaking at the wound, so it is best to support and reinforce them with bamboo 1.2-1.5 m long.