How to Treat Grapevine Canker? A Detailed Explanation of Treatment Methods

Grapevine canker can be treated with thiophanate-methyl. Grapevine canker is a common disease of grapes; after it develops, it causes fruit rot and branch cankers, and in severe cases leads to fruit cracking, rotten fruit and dead branches and trunks. The pathogen is mainly spread by rain, so prevention and control need to be timely and the methods need to be comprehensive. So, what are the treatment methods for grapevine canker?

1. What are the treatment methods for grapevine canker?

Grapevine canker can be prevented and controlled with agents such as thiophanate-methyl, flusilazole, zinc thiazole and thiodiazole-copper. In addition, diseased tissue in the field must be removed promptly, diseased branches must be pruned out uniformly, and after pruning out diseased plants, a fungicide mixed with an adhesive must be applied to the wounds to prevent the pathogen from invading again.

2. How can the fruit-setting rate of grapes be improved?

1. Prevent excessive vegetative growth

Many friends do not pay attention to vigorously growing, over-luxuriant shoots during cultivation and let them keep growing. What they do not realize is that if a certain shoot of the grapevine grows too strongly, it will affect the flowering and fruiting rate of the grapes. The growth vigor of the grapevine must not be too strong, because if it is too strong it will require a large amount of nutrients, compete for the nutrients of the lower branches of the grapevine, and cause poor development of the grapes. The ability of the newly grown branches the following year to flower and bear fruit will also decrease, so branches with strong growth should be pruned appropriately, leaving a small number of secondary shoots to increase leaf area. However, attention must also be paid to branches with weak growth, leaving more secondary shoots to sprout and strengthen growth.

2. Keep fruit reasonably

During planting, most people think that the more fruit the better, so they do not carry out reasonable flower and fruit thinning on the fruit trees. This not only fails to increase fruit yield, but also causes the quality of the grapes to deteriorate and reduces the tree vigor of the fruit trees. It causes poor development of the fruit trees, lowers the pollination rate of flower buds the following year, reduces the accumulation of nutrients in the branches of the plant, affects the flowering and fruiting rate, and thereby leads to flower and fruit drop. Therefore, we should keep fruit reasonably, control the quantity, ensure quality, and reduce the phenomenon of flower and fruit drop.

3. Ensure nutrition

Ensuring sufficient nutrition for the growth needs of the grapevine is a key factor in enhancing the growth vigor of the grapevine and improving the fruit-setting rate. After harvest, sufficient base fertilizer should be applied to the orchard, and the application amount should reach at least more than half of the fertilizer amount needed for one year. Topdressing should be done at least three times a year. The first is applying an appropriate amount of nitrogen fertilizer before budding. The second topdressing is carried out during the fruit expansion period, and the fertilizer can be decomposed farmyard manure. The last time is when the fruit colors, mainly with some trace elements, paying attention to the application of nitrogen fertilizer.

4. Prevent and control diseases

Pests and diseases are also one of the main causes of flower and fruit drop in grapes, so if you want to improve the fruit-setting rate of grapes, you must also prevent the occurrence of pests and diseases. The main pests and diseases of grapes include downy mildew and leafhoppers. After harvest every year, the orchard must be comprehensively disinfected in a timely manner, and the remaining diseased and disabled branches and affected fruits must be gathered and cleaned up. Note that they must be kept away from the orchard, and then the orchard should also be regularly cultivated and disinfected to remove pathogenic bacteria and insect eggs in the orchard, reduce pathogens, and lower the incidence rate.

For grape pests and diseases, prevention and control should be the main approach, and once infection is found, it must be treated promptly. Agents such as flusilazole, zinc thiazole and thiodiazole-copper are used for prevention and control. In addition, diseased tissue in the field must be removed promptly, diseased branches must be pruned out uniformly, and after pruning out diseased plants, a fungicide mixed with an adhesive must be applied to the wounds to prevent the pathogen from invading again.