Qingyuan Green can effectively reduce the number of pathogens and reduce the number of insect pests, laying the foundation for the prevention and control of pests and diseases in the second year and reducing stress. In particular, vineyards and old vineyards where serious pests and diseases have occurred are even more important.
I. Clear Garden Time Selection
The grape clearing garden should normally be divided into two stages. One is to combine the pruning of the grapes during the dormancy period to clear the garden (in the winter, the clear garden) and the second is to perform the clear garden in the pompon period (in the early spring to clear the garden).
For greenhouse vines, winter clearing is usually not performed due to the close proximity of pruning and budding. The dicyandiamide used in the shoot buds is acidic, and most of the clear garden agents are alkaline. The application interval is too close to affect the efficacy. Therefore, the Greenhouse Grape Park can be carried out during the pompon period and a protective agent should be sprayed during the second and third leaf stages. Note that lime sulfur and self-assembled Bordeaux mixture cannot be used in the second and third leaf stages, and phytotoxicity will occur.
Clear Garden Operation
â— After the pruning of grapes, clean up all the litter and the old bark on the main bar and the main vine and the fresh branches that were trimmed. Note that the lines or ropes used to tie the vines must also be handled together.
â— Collect dead leaves, old skin, and pruned pests, branches, etc., and concentrate deeply or burn them. This can take away a large number of germs and eggs, reduce the pressure of clear gardens, and improve the efficiency of clear gardens.
â— It can also be crushed and rot-fermented, combined with winter fertilizers and buried in fields for fertilizer. According to the occurrence of pests and diseases in the current year or in the vineyard area, the crushed foliage and old skin should be treated accordingly.
â— After pruning, use appropriate pharmaceutical agents such as lime sulfur, etc., and spray and disinfect the grape branches, frames, and soil at all levels to kill the pathogenic spores and eggs.
â— Apply whitening agent to grape trunk after spraying, which can block old vines and trunk residual bacteria, and can also play the role of insulation and antifreeze.
â— Clear Garden in spring is more important than Winter Clear Garden. Before budding, the pests enter the active period and are relatively fragile. The use of drugs is better. This period should focus on the thorough elimination of overwintering sources and eggs.
Second, grape clearing agent selection
Lime sulfur
Lime-sulfur mixture is a clear garden agent used by many orchards for many years, and can be self-controlled or purchased directly. Through strong alkalinity, we carry out the protection of pathogens, the burning of eggs, contact killing, and the isolation of external germs at the same time.
Main features: Because it only has contact and protection, therefore, the effect of the sprayed medicine is better, and there is no effect where the medicine is not sprayed. The insecticidal effect is not good, and can not be compounded with most of the highly effective insecticides; if the temperature is required, the effect of over-lowing is not obvious. When it is too high, it is prone to phytotoxicity and causes sprout burning. If it is intolerant to rain, it will lose its effectiveness. Facilities or rain orchard-cultivated orchards will easily cause corrosion of the steel frame and affect its service life.
Sulphur Water Dispersible Granules
It can be considered as an evolutionary version of lime sulfur. It is safer than lime sulfur and it is nearly neutral in pH.
Main features: It has good control effect against powdery mildew, rust, red spider, thrips and other pests. Resistant to rain erosion, fine particles and rapid action, it is very effective even at low temperatures. It has good compounding properties and can be formulated with high-efficiency insecticides such as deltamethrin, and also acts on pests and diseases.
Bordeaux mixture
Bordeaux liquid can kill a variety of fungi, bacterial diseases, especially in areas where it is rainy after pruning, Bordeaux mixture is the most suitable, and can be configured or purchased directly.
Main features: Bordeaux fluid has good protection and long effective period, but it cannot kill powdery mildew, red spider and other pests.
Flusilazole + chlorpyrifos
In terms of prevention and control, both the insecticidal and bactericidal aspects are taken into consideration, and the effectiveness of the control is good, and it will not affect the subsequent use of drugs.
The main features: worms and killing, a broader spectrum, Qingyuan more thorough. The lack is lack of relevance.
Third, the Qingyuan Notes
1 Clearing the garden should be thorough. Not only do the grape plants clear the garden, but at the same time they must pay attention to the garden's iron wire, cement pillars, and the clear garden of the ground.
2 The old trees of the grape are to be scraped off by the branches and old skins; the open air or shelter from the rain is also used for clearing the gardens around the weeds.
(3) The choice of the cleansing agent should be determined based on the occurrence of previous diseases, weather, and other factors, so that the effect is better. Bordeaux mixture is used in areas or years where there is more rain, lime sulfur is used in years of drought, and fluorosiliconazole + chlorpyrifos are used to clean up the disease in multiple pests and diseases.
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