Causes of leaf curling of passion fruit and its control methods

Passion fruit is one of the popular fruits in the market at present, and its economic benefit is high. However, the leaf curling phenomenon often occurs in the process of Passion fruit planting, which seriously affects the yield of Passion fruit and reduces the planting benefit. So what causes passion fruit curls? How to prevent it? Let's get to know each other.

1. High temperature effect

When the temperature is higher than 30 degrees, it will affect the growth of passion fruit. If the temperature is higher than 35 degrees, it will intensify the transpiration of leaves, so that the transpiration speed of leaves is greater than the water absorption speed of roots. It is easy to lose water, the temperature of leaves is forced to close, and the leaves appear dehydrated and curly.

Prevention and control methods: to raise the roots, improve the absorption capacity of the roots, at the same time reasonable watering and fertilization, so as to avoid too dry soil, should not be watered and fertilized at noon during the day, will aggravate the leaf roll phenomenon, when the leaf roll occurs seriously, can spray brassin, alleviate symptoms.

2. Impact of rainy season

After planting, the soil is too dry, and when the rainy season comes, too much rain, the roots are soaked for a long time, which will lead to the suppression of transpiration of the leaves, and the leaves will appear reverse because of self-protection. The rainy season is too long, the branches and leaves are closed, and the photosynthesis is weak, which will also cause the nutritional imbalance of the stems and leaves and the phenomenon of rolling leaves.

Prevention and control methods: reasonable irrigation in seedling drought, do a good job of water conservation harvest, avoid excessive soil drought after planting, and should not flood irrigation after drought, in addition to drainage measures in rainy season, do a good job of root care, reduce leaf roll occurrence.

3. Phytotoxicity

Summer temperature is too high, in the use of pesticides is not pay attention to the concentration of chemicals, phytotoxicity will occur, resulting in discoloration or small spots on the surface of the leaves, while the leaves will curl upward. In addition, when herbicides are used in adjacent fields, it is easy to drift with the airflow, causing phytotoxicity to passion fruit and inducing leaves to curl upwards.

Prevention and control methods: in summer high temperature spraying pesticide to reduce the concentration, once the occurrence of phytotoxicity, to spray water or brassin timely relief, general leaf roll symptoms can be timely top or cut off the affected branches and leaves, or spray Bihu, increase the application of organic fertilizer, the effect will be better.

4, fat damage

Fertilization can obtain higher yield, but improper fertilization will cause root burn and leaf roll, excessive nitrogen fertilizer, especially excessive nitrate nitrogen application, will increase the concentration of soil solution, causing passion fruit leaves to turn over, roll up, excessive ammonia nitrogen in the soil, leaves will bulge, leaflets are inverted bottom shape.

Control methods: reasonable fertilization, especially to control the application of nitrogen fertilizer, pay attention to fertilizer and water management and fertilizer reasonable mix, especially in the rainy season, in order to prevent excessive growth of plants, more nitrogen fertilizer should be controlled. Can use a variety of micro-fertilizer, mixed application of other fertilizers, with a variety of micro-fertilizer, mixed application of other fertilizers, to ensure that the passion fruit flowering period sufficient fertilizer water supply.

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