During the growth process of radish, it is mainly affected by insect pests such as small cabbage moths, grubs, ground tigers, aphids, and green vegetable insects, resulting in unfavorable factors that have a certain impact on their yield and quality. Reasonable and effective prevention and control has positive significance for the entire fertility and growth period of radish.
One: control of small cabbage moths
The small cabbage moth, also known as the small green worm, is a migratory flying pest. Its reproductive speed is fast, it can change over generations in a year, and it is highly resistant and harmful. It is harmful to cruciferous floral plants, including turnips. The small vegetable moth generally lays eggs on the back of the radish leaf, causing harm by the hatched larvae nibbling on the leaf flesh, forming transparent disease and insect spots on the leaves, as if they are opening a "skylight" on the leaves. 3 to 4 larvae can eat the leaves into holes and gaps, without effective control, and the whole leaves of the more serious radish are eaten into a network by them.
Control measures: Avoid the annual crop rotation of cruciferous vegetables in a wide range to eliminate the accumulation of insect sources. Strengthen the management of radish seedling stage, and deal with stumps and leaves in a clean and timely manner to eliminate a large number of insect sources. According to its phototropism characteristics, black light can be placed to trap it, or 40 small cabbage moths can effectively interfere with adult mating and reduce eggs.
Optional biopesticides: Kale nocturnal moth nucleotype polyhedral virus 600 times liquid, or 0.3% neem emulsion 800 times liquid uniform spray.
Selection of chemical agents: 1000 to 200 times of 5% stellaria sulva emulsion oil can be selected at the 2 stage of larval larvae, or 10% insect mite nitrile suspension 1500 to 3000 times liquid, or 5% fipronyl urea emulsion oil 1000 to 2000 times liquid for uniform spraying.
Second: the prevention and control of grubs
It tends to be uncorried manure, and the larvae inhabit the soil to nibble on seeds, rhizomes, root blocks, and seedlings. Adult insects eat leaves and fleshy root blocks of radish, and the root blocks are mainly bitten and drilled, forming a gap in the root blocks of radish, causing decay and reducing its quality. Nowadays it is the adult stage.
Prevention and control methods: clean plots; deep soil transformation; agricultural fertilizer (organic fertilizer) decomposition; reasonable (water and drought) rotation.
During the sowing period, BT powder (10 billion spores/g) can be mixed according to the drug species 1:10; green zombie powder (2 billion spores/g) and white zombie powder (4 billion spores/g) can be mixed according to the drug seed 1:10 ratio; radish growth period can be used: white zombie powder (4 billion spores/g) 1.5 kg, green zombie powder (2 billion spore/g) 1.5 kg mixed with water 100 to 150 kg for root irrigation control.
Three: the prevention and control of ground tigers
Its insects are also known as soil silkworms and ground silkworms. Intolerance to low temperatures, with July to October occurs generally. The larvae cluster on the heart and back of the seedlings to bite and eat, and after 3 crows, they can bite off the stems near the ground, so that the whole plant of radish dies and forms a missing seedling ridge.
Control measures: clean the plot; remove the dead leaves; shovel the pupa during the occurrence of the insects, and use the late autumn or early winter to turn the rake deeply. Adult insects can be booby-trapped with insecticidal lamps or ground tiger sex traps.
Using medicinal seed mixing, the optional 70% thiamethoxine dry powder seed coating agent is carried out according to the specific amount of 300 grams of seeds treated with 1 gram; in its severe period, 20% cypermethrin emulsion 3000 times liquid and 20% chrysanthemum can be used. Horse emulsion 3000 times liquid, 50% octyl thiophos emulsion 1000 times liquid, 5% cypermethrin emulsion 2000 times liquid for fine mist spray prevention.
Fourth: control of aphids
Aphids are also known as greasy worms. It breeds the fastest in spring and autumn, and the long hazard period is generally seen from March to November. Adult insects are mainly concentrated on the back of young leaves, young leaves, stems, and turnip ground, and suck up sap, which frustrates plant growth, and can spread the virus and expand the affected area.
Control measures: clean the countryside without leaving weeds; disinfect the soil of the plot to kill insect eggs and pathogenic bacteria; use the yellow plate to trap aphids.
At the seedling stage, you can choose 3% acetamidine emulsion 2000 times liquid spray prevention, 1.8% avermectin emulsion 200 times liquid during the growth stage, or 1% neem aqueous agent 800 times liquid spray control.
Fifth: the control of vegetable insects
Green worms are generally similar to the leaf color of radish, and are particularly recessive, and tend to occur from April to October. The larvae eat the leaves; 2 pre-eels eat the flesh of the leaves; 3 gnaw on the holes in the leaves, and even eat the entire leaf leaves, leaving only the coarser veins, and the petiole, resulting in a harvest. The survival period of the insects is 2 to 5 weeks, with 5 to 6 generations occurring every year, and the most serious pests are from the end of April to June; the amount of rainy and wet insects decreases from July to August; and the insect population recovers in September.
Prevention and control measures: do a good job of cleaning the plot, and clean up the residual weeds in time after harvesting.
Optional biopesticides: 1% Avermella emulsion 2000 to 2500 times liquid; or 20 larval units/acre spray of butterfly granule virus. The selection of chemical agents takes the peak of larval occurrence as the optimal period for medication, and can choose 60 g/l ethyl polyathricide suspension 2000 to 20500 times liquid, or 10% cypermethrin emulsion 1500 times liquid; or 50% octhiophosphorus emulsion 1000 times liquid and other sprays 2 to 3 times, with an interval of 3 to 5 days.