How to prevent the curling of tomato leaves

There are two common situations of tomato leaf curling:

1. Physiological curling leaves. That is, to the fruiting stage, the lower old leaves curl upward. This is often caused by an imbalance in the supply of nutrients. Especially after topping, because the vegetative growth is still prosperous, the growth of the front of the leaf can not keep up with the growth of the back of the leaf, resulting in rolled leaves. There are differences in this kind of curly leaves among different varieties. The more sensitive ones are more obvious. However, this situation has little effect on tomato yield. You don't have to prevent and cure it.

2, heart leaf hair curls, sometimes accompanied by wrinkled mosaic, which is due to the occurrence of viral disease. For example, cucumber mosaic virus sometimes looks like this.

At this time, we can prevent and cure according to the virus disease. For example, morpholine guanidine copper is used to relieve symptoms. However, a more thorough method is to use disease-resistant tomato varieties, the use of yellow pull, screen to avoid aphids, to prevent aphids from spreading when feeding. There would be no leaf curl.