The causes of the latest passion fruit leaf curling and its control methods

Passion fruit is one of the most popular fruits in the market at present, and its economic benefit is high, but the phenomenon of rolling leaves often occurs in the process of passion fruit planting, which seriously affects the yield of passion fruit and reduces the planting benefit. So what is the cause of passion fruit rolls? How to prevent it? Let's get to know it.

1. The influence of high temperature

When the temperature is higher than 30 degrees, it will affect the growth of passion fruit. If the high temperature continues above 35 degrees, it will aggravate the transpiration of leaves, so that the transpiration rate of leaves is greater than the rate of water absorption by roots, which is very easy to cause water loss of plants. The temperature of the leaves is forced to close, and the leaves appear dehydrated and curled.

Prevention and control methods: to cultivate roots, improve the absorptive capacity of roots, and at the same time reasonably water and fertilize the soil to avoid excessive drought, it is not suitable to water and fertilize at noon during the day, which will aggravate the phenomenon of leaf curling. when leaf curling occurs seriously, brassin can be sprayed to relieve symptoms.

2. The influence of rainy season

After planting, the soil is too dry, there are too many Rain Water in the rainy season, and the roots are soaked for a long time, which will lead to the inhibition of leaf transpiration and the reversal of leaves because of self-protection. If the rainy season is too long, the branches and leaves are airtight and the photosynthesis is weak, which will also cause the malnourishment of stems and leaves and the phenomenon of rolling leaves.

Prevention and control methods: rational irrigation should be done during drought at seedling stage, water conservation and harvest should be done well, excessive drought of soil after planting should be avoided, and flood irrigation should not be carried out after drought. In addition, drainage measures should be taken well in rainy season to take good care of roots and reduce the occurrence of leaf curling.

3. Drug damage

Summer temperature is too high, in the use of pesticides is not pay attention to the concentration of pesticides, drug damage will occur, resulting in discoloration or small spots on the surface of the leaves, while the leaves will also curl upward. In addition, when herbicides are used to control weeds in nearby fields, it is easy to drift with the air flow, causing drug damage to passion fruits and inducing leaves to curl up.

Prevention and control methods: the concentration should be reduced when spraying chemicals at high temperature in summer, and once the drug damage occurs, it should be alleviated by spraying water or brassine in time. The general symptoms of leaf curling can be topped or cut off the damaged branches and leaves in time, or spray green protection, and increase the application of organic fertilizer. the effect will be better.

4. Fertilizer damage

Fertilization can obtain higher yield, but improper fertilization will cause root burn and leaf curl, and too much nitrogen fertilizer, especially too much nitrate nitrogen, will increase the concentration of soil solution and cause passion fruit leaves to turn and roll up. When there is too much ammonia nitrogen fertilizer in the soil, the leaves will bulge and the leaflets will be in the shape of inverted boat bottom.

Prevention and control methods: rational fertilization, especially to control the application of nitrogen fertilizer, pay attention to the reasonable combination of fertilizer and water management and fertilizer, especially in the rainy season, in order to prevent overgrowth of plants, we should control the application of nitrogen fertilizer. Can use a variety of micro-fertilizers, mixed application of other fertilizers, with a variety of micro-fertilizers, mixed application of other fertilizers to ensure an adequate supply of fertilizer and water during the flower and fruit stage.

The above is the introduction of passion fruit leaf rolling causes and control methods, hope to help you, want to know more related knowledge, please pay attention to us.