Technology of controlling soybean diseases with JKDUKE

Jukeduke (2% Ningnanmycin water agent) is a new biological pesticide successfully developed by Chengdu Institute of Biology, Chinese Academy of Sciences, which has the characteristics of high efficiency, wide popularization, environmental protection, promoting crop growth, improving quality and increasing income. It has a good control effect on soybean root rot, blight and other diseases.

I. Control of soybean root rot

The main results are as follows: 1. symptoms infected at the seedling stage, brown oval, elongated or irregular disease spots were formed at the base of the diseased plant and stem, which were slightly sunken, and then formed large patches around the main stem, even harming the lateral roots. in the later stage, the root of the diseased plant became dark brown, the epidermis rotted, the lateral root and fibrous root were few or necrotic, the diseased plant was short and yellow, and the lower leaves fell early. Except for a few serious damage at the seedling stage, the diseased plant generally did not die, but there were few pods and seeds. Affect the output.

2. Chemical control method seed disinfection method, that is, before sowing, the seed is wet mixed with 2% JK water agent (the dosage is 1: 1.5% of the seed weight), and then stuffed, dried and sown. It can be mixed with organophosphorus insecticides in the occurrence area of soybean seedling pests. If the root rot occurs during the growth period of soybean, the plant can be sprayed with 2% JK water agent 200: 260 times with lobular enemy or foliar fertilizer, which has a good control effect on soybean root rot, and the phenomenon of soybean wilt and plant death can be relieved after a few days. the leaf color returns to normal and can still achieve high yield and harvest. This technology has been widely used in the main soybean producing areas.

II. Prevention and control of soybean blight

The main results are as follows: 1. Symptoms can occur throughout the growth period, and the pathogen can infect the roots, stems and leaves of the plant, resulting in root rot, stem rot, plant dwarfing and wilting. After sowing in the field, the rotten seedlings were caused, the seedlings collapsed before or after they were unearthed, and the damaged roots became soft and brown. In the true leaf stage, the stem of the injured seedlings showed water stains, and the leaves turned yellow, withered and quickly maimed. When the adult plant was killed, the veins of the lower leaves were yellow at first, and the upper leaves quickly lost green, then the whole plant withered and died, and the damaged roots turned brown.

2, the method of chemical control: seed dressing, wet seed dressing with 2% fungus-gram-poison-gram water agent (1500 ml agent mixed with 100kg bean seeds) according to the drug ratio of 1.5 ∶, then pile up stuffy, dry and then sow the seeds. During the growth period, the disease can be diluted with 2% bacterial gram poison water agent into 250 million 300 times liquid spray, with uniform spraying and no leakage spray as the standard, the control effect is better.

III. Prevention and control of soybean mosaic virus

The main results are as follows: 1. the symptomatic leaves showed mosaic, wrinkled or mottled, curled leaves and yellow patches, some formed pathogens or disease spot necrosis along the main vein, some leaf veins necrotic, some formed top withered, and the infected plants were dwarfed at the seedling stage. the seeds of the diseased plants are generally brown spots or flower beans.

2. The medicament control method begins to use medicine when the disease is about to occur or at the initial stage of the disease. 2% JK water agent is diluted into 250 times 300 times liquid spray, with uniform spraying and no leakage spray as the standard, continuous application for 2 times for 3 times, each time at an interval of 7 to 10 days. If aphids occur in the field, it can be mixed with imidacloprid, foliar fertilizer and so on, the effect is better.

4. control of Sclerotinia sclerotiorum

The main results are as follows: 1. The disease mainly damages the stem of the plant, which starts from the middle and lower branches of the main stem of the plant. The disease spot is waterlogged, irregular, light brown or nearly white, which can surround the stem and spread up and down. the browning and death of the upper leaves of the plant in the field is the first to attract attention.

2. Chemical control methods during the sclerotia germination and invasion period, the water was evenly sprayed with 2% gram gram water agent 200 ml 250 ml per mu.

After several years of popularization and application, it has been proved that this technology has a good control effect on many kinds of soybean diseases, so it is suggested that it should be demonstrated and applied in a large area in soybean production in the future in order to give full play to its social benefits.