What remedial measures are there after a kiwifruit tree is damaged by freezing?
Kiwifruit has strong adaptability to the environment and is grown in most parts of our country. However, due to the influence of climate conditions, in some regions we need to make preparations for overwintering and cold protection for kiwifruit before winter arrives. But sometimes freezing damage still occurs, so after a kiwifruit tree suffers freezing damage, how should we carry out remedial measures? Let us learn about it together below.
1. Strengthen management and supplement nutrition
After kiwifruit suffers freezing damage, its vitality is very fragile at this time. In order to restore the growth of the kiwifruit tree, we need to strengthen soil and fertilizer management in the orchard and supplement the nutrients needed for kiwifruit growth, so that the tree vigor can be restored as quickly as possible. First, we should increase fertilizer application and combine it with watering, and spray an appropriate amount of photosynthetic nutrient film fertilizer, which can strengthen the tree's photosynthesis, improve fertilizer use efficiency, and promote the growth of new branches. Alternatively, we can spray nutrients such as Nengsu, Yizhikang, and Yiyangyuan microbial inoculant, which are also nutritional agents used to promote the growth of branches and leaves and enhance vitality.
2. Carry out bridge grafting, grafting, or replanting
Bridge grafting is generally used when the kiwifruit tree has suffered only a relatively small degree of freezing damage, or for young bearing trees in the early stage; then we can carry out bridge grafting on the frozen part of the trunk before budding to remedy it. But if the kiwifruit tree has suffered severe freezing damage, then we have two ways to deal with it. The first is to cut it back to the ground as soon as possible, re-graft a new variety, and strengthen management. The second is to replant and fill in the missing plants, so as to achieve early bearing and high yield as much as possible.
3. Prune freeze-damaged branches
After the kiwifruit tree suffers freezing damage, after the new branches bud, we need to prune off the freeze-damaged parts, and also prune off all the remaining branches and leaves as much as possible, leaving only one branch that can grow into a canopy in the same year. In addition, after pruning off the freeze-damaged parts and other branches, in order to prevent the branches from being infected by pathogens, we had better apply a layer of antiseptic film in time, which can effectively protect the branches and promote wound healing.
4. Do a good job in pest and disease control
After a kiwifruit tree suffers freezing damage, its own immunity and resistance are correspondingly reduced. If protective measures are not taken, it is very easy for it to be damaged by pests and diseases. First, we need to prune off the freeze-damaged branches, then seal the pruned areas with 50-fold oil emulsion, and when the buds are about to sprout, we can spray an appropriate amount of lime sulfur mixture at the appropriate Baumé degree, which can effectively prevent canker and other pests and diseases.
The above are the remedial measures we can take after kiwifruit suffers freezing damage that I want to share with you today. I hope it can help friends in need. If you still have other questions, or want to learn about measures to prevent freezing damage in winter, you can also consult me or leave a message.