Li Qiu quietly arrived, and the stalks that began to be released after today are really called autumn stalks. Along with the autumn shoots, there is this little thrips.
Thrips believe that everyone is familiar with it, just like pineapple buns do not have pineapples, wife cakes do not have wives, and thrips are not horses, which is a collective name for tauroptera insects. Citrus is an evergreen fruit tree with many branches, large flowers, and dense fruit, and it is planted in a wide area, and thrips will certainly not let go of such a good meal. There are more than 30 kinds of thrips commonly found in citrus, and I will not name them here.
Thrips adults and their hazards
Hazard characteristics of thrips
Thrips have the characteristics of being tender and sweet, so they can cause harm to new shoots, flowers and young fruits. Now that citrus everywhere has entered the autumn shoots, and is facing high temperature weather, we must be careful that autumn shoots are harmed by thrips.
The leaves appear curled up after being infested by thrips
New shoots are affected: there will be small spots of greenish yellowish white at the beginning, followed by thinning of the leaves, thickening of the leaf flesh, hardening of the leaf margins, and distortion of the leaves.
Old leaf victimization: grayish-white or gray-brown stripes appear on both sides of the midrib, and the leaves curl upwards and deform.
After the leaves are damaged by thrips
The thrips appear after the fruit is harmed
Fruit damage: Thrips like to hide, so the sepals or fruit stalks are the main places of activity, and the later fruit injuries are mostly concentrated here. Don't look at his insect body is not large, the file suction mouthpiece has a first-class injury ability. It eats young fruits under sepals, files the young fruit peel, ruptures the epidermal cells of young fruits, gradually loses water and shrinks, and the scar expands with the expansion of the fruit, showing different shapes of wood-embolized silver-white or gray-white spots.
Thrips are difficult to control
Although the thrips are small, they are extremely harmful and difficult to control.
Tea yellow thrips adults and nymphs Source: Network One is that thrips are individually tiny, generally 1-2 mm in length, and some species are even only 0.5 mm, hidden in various parts of the plant, difficult to find with the naked eye, usually after symptoms, they will realize that there are thrips.
Second, thrips have the habit of lying diurnal and nocturnal, and only move on the surface of the host on cloudy days, mornings, evenings and nights. Usually like to hide in the flowers and the back of the leaves, while the eggs are generally in the plant tissue, it is difficult to kill. Third, the adult thrips are good at flying and jumping, and can escape around with the help of external forces, so once the thrips occur, they spread quickly and are difficult to control. Fourth, the breeding period of thrips is very short, it takes only 14 days from eggs to adults, the generation changes quickly, it is easy to flood, and it is another difficulty in prevention and control. Fifth, after a long period of baptism of medicine, thrips have developed different degrees of resistance to some agents.
It is even more difficult to prevent
Citrus orchards are first in the flowering period, the second is in the young fruit stage after the flowering, and the third is in the autumn shoot extraction period in September and October, that is, at present, the most prone to outbreaks of thrips infestation. We need to do a good job in the prevention and control of thrips in advance, and do not wait for the new shoots to appear symptoms before doing it. At this time, the new shoots have been distorted and deformed, and the growth of the leaves will be inhibited, and it is difficult to exercise normal physiological functions, so how can the autumn shoots be abundant in the next year.
Thrips are harmful
(1) Taking advantage of the characteristics of thrips and other insects to tend to blue, combined with insect-based core trapping, 20 to 30 pieces/mu of thrips are suspended at the beginning of the occurrence of thrips, reducing the population density of harm. (2) Thrips have the habit of pupating into the soil, and ground covering or grass can be carried out during the main occurrence period of thrips. (3) Pharmacy prevention and treatment to seize the appropriate period, each batch of shoots just out of the time must pay attention to prevention and control, generally 10-15 days a drug, severe 7 days a drug, rotate the drug. When selecting a drug, it is necessary to select a quick-acting and a potent agent to use with each other, spray the whole plant when spraying, spray evenly, and spray it together if there is a set of seeds.
Edit: Little Sister Orange