Control measures of papaya rot head disease
Papaya has different degrees of rotten head, and even lodging and dead plant phenomenon, should be the occurrence of stem rot, high temperature, rainy and humid, more prone to disease. Prevention and control: commonly used for root rot of melons and vegetables, blight or bacterial agents. If a diseased plant is found, remove the soil from the neck of the diseased plant, scrape off the infected cortex and tissue with sterilized bamboo slices or knives, and then use one of the following drug formulations to smear the diseased part and irrigate the roots until the wound dries. One is Redomir + allicin; the other is 50-100 times the solution of Sandufan + agricultural liensin (or thiazolyl zinc); serious papaya orchards should be sprayed every 5-7 days for 2-3 times. After healing to restore the tree potential of the plant, the wound is easy to break, it is best to use 1.2-1.5 meters of bamboo support reinforcement.
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Economic fertilizer application amount and suitable proportion of papaya trees
The amount of economic fertilizer application is the lowest amount of fertilizer application when high yield, high quality (or high economic benefit) is obtained due to the effect of fertilization. Practice has proved that, in a certain range, the yield and quality often improve with the increase of fertilizer application. However, when the amount of fertilizer application reaches a certain level, the yield and quality of fruit will increase with the amount of fertilizer application.
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There are ways to protect papaya from cold.
Papaya is a tropical crop, like hot climate, avoid low-temperature frost. Freezing injury occurs when the temperature is lower than 5 ℃. It is very important to take the following measures to prevent freezing: re-application of overwintering fertilizer. Each tree is treated with 10kg of organic fertilizer mixed with mature human and animal manure and plant ash, and 1.5 kg of phosphate fertilizer. At 80cm and 100cm from the trunk, dig 2.
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