During the growth period, cotton will suffer from a variety of different pests and diseases, of which the blind bug is one of the most common pests, its ravages can seriously affect the quality and yield of cotton, but also cause great losses to cotton farmers. Therefore, it is necessary to do a good job in the prevention and control of cotton blind bugs. The technicians of the small cotton jacket summarized the following prevention and control measures from the harmful characteristics, living habits and prevention and control points of the blind bugs for the reference of cotton farmers.
First, the harmful characteristics of the blind bug
The blind bugs belong to the family Cloptera blind. There are many kinds of it, and there are more than 20 kinds of harmful cotton. Among them, the most serious harm are green blind bugs, medium black blind bugs, three-point blind bugs and so on. Blind bugs on cotton harm time is long, from the seedling stage to the spitting stage, the harm up to 3 months, blind bugs generally to adult insects, nymphs suck the sap of cotton plants, causing a large number of bud bells to fall off, broken heads, broken leaves, branches and leaves, the main head after the damage caused by multi-head co-growth "multi-head cotton"; in the cotyledon stage growth point is destroyed and blackened dry, no longer grow, after the emergence of true leaves, the top buds are damaged and dead, uncertain buds, become multi-headed cotton, the victim of the young leaves are initially small black spots, the leaves are flattened after a large number of broken, custom is called " Leaf breaking madness"; the top heart and the edge of the heart are killed, forming a "broom cotton" from the branches and leaves; after the young buds are affected, the buds often open, first yellow-brown, and then dry off, forming a "male cotton", the light wound after the young bell is damaged appears water-stained spots, the heavy cotton bell is rigid and falls off, the cotton bell is covered with black spots after being damaged, and the later rigidity falls off to form a stiff petal.
Second, the occurrence characteristics of the blind bug
Blind bugs occur in 4-5 generations a year and overwinter in the form of eggs in the stubble of dead branches of fruit trees and the bell shells of cotton. Hatches in early april and invades cotton fields in mid-to-late June. June is the peak of the hazard period, cotton blind bugs have a wide range of hosts, a long spawning period, and a serious overlap of generations in the field, so it is necessary to adapt to the time when preventing and controlling. The blind bug also prefers a warm and humid environment, with temperatures of 25-30 degrees Celsius and 80% relative humidity being the most suitable for its reproduction.
Adult blind bugs have habits such as metastasis, phototropism, and color-seeking, floating on top of the cotton plant before 9 a.m. or after 6 p.m., and resting on the back of the middle of the cotton plant at noon. The blind bugs also like to bite the tender parts of cotton, especially when the chemical control is not timely, the growth is vigorous and dense, and the cotton fields that are late after the wind and rain are often more harmful.
Third, the prevention and control measures of the blind bug
1, agricultural control: (1) before the eggs hatched to live on the field, the ground, roadside, ditch weeds, to remove the field weeds. After hatching, spray pesticides to the host to reduce the insect population base; (2) apply nitrogen fertilizer in a timely manner to prevent cotton growth and cotton field closure; (3) when "multi-head cotton" appears in the cotton field, the whole branch should be removed in time, leaving 1-2 strong branches (4) excessive growth, and the lush field should be ventilated and transparent.
2, physical prevention: blind bugs have color tendency, more "lustful", especially like blue and green, can use this property, can make a color plate for centralized booby traps.
3, ecological control: the establishment of field "booby trap belt", after years of field observation experience shows that the blind bugs prefer mung beans, sunflowers and other crops, especially mung beans, planting favorite crops next to cotton, easy to booby trap control.
4, chemical control: (1) to the whole piece of prevention, the whole piece of treatment, from the four sides to the middle spray prevention and control, the surrounding contiguous plots of all prevention and control; (2) can start the prevention and control now, it is best to choose the evening and cloudy days; (3) the control agent to choose acetamidine + avermectin, or the use of flufenacine cyanide control, or 35% saidan. In order to protect the natural enemies of aphids, it is strictly forbidden to use oxidized fruit, butyrothic budweiser, and organophosphorus insecticides.
Please grasp the harmful characteristics, occurrence rules and living habits of blind bugs, and do a good job in prevention and control from now on! In addition, what other diseases and pests have been encountered in the cotton fields recently? How effective is the control? Friends are welcome to send photos or videos to the backstage of the little cotton jacket, and we will find a way together.