Due to the continuous cropping of wheat for many years, the soil organic matter is too small, coupled with adverse weather effects, resulting in aggravation of wheat root rot, which has become one of the main diseases in wheat fields. Promptly carry out pesticide control to recover losses.
Is a wheat root rot fungal diseases caused by imperfect fungi Helminthosporium fungal infections caused by. The pathogens are lurking in the seeds and in the soil, and can survive for 1 to 1.5 years with the diseased plant residues. The whole growth period of the wheat can be affected. The germs are initially dyed to damage the roots and seedlings of the wheat, re-infested through wind and rain, and the wheat is damaged after the flowering. The heaviest, brown or black lesions in the roots, and finally rot, the diseased plants showed "fake drought", and "white ears" appeared, and the pieces died dry. The affected fields generally reduce production by 20% to 30%, and the weight is over 50% or even overwhelming.
The comprehensive control measures for wheat root rot are: the serious plots should be rotated for 1 to 2 years, and the prevention and control of chemical chemicals should adopt the method of “one piece of cure and one piece of cureâ€. Through several years of trial screening, we must do a good job in the prevention and control of the following three links:
1. After arable land, use 50% Familia double 1.5~2kg for 667 square meters, mix fine soil (sand) 20kg, and smash the head for sputum.
2, before seeding with 0.03% ~ 0.04% of the amount of seed azole mixed seed (ie 3 ~ 4g 12.5% ​​special azole wettable powder plus appropriate amount of water, seed dressing 10kg);
3. After the wheat is up, combined with the prevention and treatment of sheath blight, spray with 2.5% of the specific azole 2500 times. According to the survey statistics, compared with the control field, the secondary roots increased by 5-8, the number of tillers increased by 0.5-2, the plant height decreased by 5.2-12 cm, the root system was developed, the stems were thick and not lodging; The onset of the disease was delayed by about 10 days, and the degree was lighter. There was no “fake drought†and “wild white spike†at the earing stage. The number of kernels per spike and 1000-grain weight increased by 1.9-7.4 and 2-4.6 g, respectively, with an average yield increase of 13.7%.
China Pesticide Network reminds everyone that in addition to excellent endocrine and bacteriostatic functions, special azole has an obvious control effect of paclobutrazol. The dosage should be strictly controlled when used, and the amount of seed dressing should be controlled within 0.05%. Sowing on the ground to prevent the formation of water after sowing, causing the formation of seedlings; the sowing depth is generally 3 to 5 cm.
Commonly used distance measurement methods include tape measure distance and photoelectric distance measurement. The measuring distance of a tape measure is measured along the ground using a tape-like ruler that can be rolled up, which is a direct measuring distance. Photoelectric ranging is to use an instrument to transmit and receive modulated light waves between two points, and measure the distance according to its propagation speed and time. It belongs to electronic physical ranging. Photoelectric ranging is indirect ranging.
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