Symptoms and control methods of Luohanguo fruit cracking disease

Fruit cracking is a kind of physiological disease, which is an important physiological disease in tissue culture seedlings of Siraitia grosvenorii.

Symptoms: mainly occurred in the near maturity of the fruit, the pericarp and pulp were longitudinally cracked, losing commercial value.

Pathogen: it is a physiological disease, which is caused by adverse factors such as imbalance of soil moisture and sharp changes in air temperature.

The characteristics of the disease: during the fruit expansion period, there were serious high temperature weather, soil water imbalance, physiological calcium deficiency, partial application of nitrogen fertilizer and serious diseases and insect pests in orchards.

Prevention and cure method

The main results are as follows: (1) strengthen orchard management, increase the application of rotten organic fertilizer, increase soil calcium nutrition, reasonable irrigation, combined with soil preparation, apply lime, enhance tree potential and improve tree disease resistance. Prune scientifically, cut off diseased and dense branches, adjust ventilation and light, pay attention to orchard drainage measures in rainy season, ploughing and weeding, and maintain proper temperature and humidity. Combined with pruning, cleaning the orchard to reduce the source of disease.

(2) the proper retention of a small amount of weeds in the orchard in high temperature and dry season can play the role of water retention, cooling and humidification, and regulating soil moisture.

(3) strengthen the prevention and control of diseases and insect pests.

(4) combined with the application of flower-promoting fertilizer and fruit-strengthening fertilizer to supplement calcium to the plant in time, active calcium mixed with water irrigated root and fruit non-crack were sprayed on the leaf surface, and the foliar spray of boron, molybdenum, zinc and calcium was 1500 times.