Method for preventing and treating fruit and vegetable downy mildew by utilizing baeckea frutescens branch and leaf extract

Abstract

The invention belongs to the technical field of plant disease and insect pest protection. The invention particularly relates to a method for preventing and treating fruit and vegetable downy mildew byutilizing a baeckea frutescens branch and leaf extract. The method comprises the steps that before seeds / seed stems of fruit and vegetable crops are planted, a bactericide prepared by mixing the baeckea frutescens branch and leaf extract and a schisandra chinensis extract is used for soaking, and after fruit and vegetable crop seedlings are planted, the bactericide is used for spraying the fruitand vegetable crop seedlings; when fruit and vegetable crop plants have preliminary symptoms of downy mildew, the bactericide is adopted to spray diseased plants and plants adjacent to the diseased plants, and in root irrigation treatment and other modes. By means of the method, fruit and vegetable downy mildew can be effectively prevented and treated, harm of downy mildew in the fruit and vegetable crop growth process is reduced, the use amount and use frequency of chemical pesticides are reduced, and the method is free of pesticide residues, safe and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of protection against plant diseases and insect pests, and in particular relates to a method for preventing and treating downy mildew of fruits and vegetables by using extracts from pine branches and leaves. Background technique [0002] Downy mildew refers to a plant disease caused by downy mildew in fungi, commonly known as black hair disease, which is an important disease in the growth of melon vegetables. The disease can occur at all stages from seedlings to harvest, and the adult plants suffer the most. It mainly damages the leaves and develops from the base to the upper leaves. In the early stage of the disease, light yellow sub-circular to polygonal lesions are formed on the leaves, which are prone to be complicated by angular spot. When the air is humid, a frosty mold layer is formed on the back of the leaves, and sometimes it can spread to the leaves. In the later stage, the disease spots are with...

AI Technical Summary

Problems solved by technology

[0005] At present, the domestic treatment of downy mildew is mainly based on the control of chemical agents, but the long-term use of chemical agents, coupled with the addition of more and more other agents by farmers privately when using drugs, not only greatly increases the cost of using drugs, but also increases the amount of pesticide residues. The loss of pesticides is serious, and long-term consumption of food that has been applied with such drugs will cause chronic toxicity to the human body, especially delayed neurotoxicity, which has threatened the living environment of human beings; in addition, the wide application of chemical agents has endangered Ecological agriculture has caused serious pollution to soil and water resources, which is seriously inconsistent with the modern concept of green, environmental protection, health and sustainable development