Mr. Zhu: Hello, Dr. Nong. I would like to ask about the best pesticides to use before cherry blossoms bloom and how to manage the trees during this period.
Dr. Nong: Hello, Mr. Zhu! Thank you for your question. Before the cherries start to ripen, the main focus is on flower and fruit management. This includes pollination, fruit thinning, and protection of the developing fruits.
Cherry trees have low self-pollination ability, so it's essential to ensure proper pollination. When planting a cherry orchard, it's important to include pollination trees. Additionally, artificial pollination or using pollinators like bees can help increase the fruit set rate. You can also spray a solution of 0.3% urea plus 0.3% borax or 0.5% potassium dihydrogen phosphate every 10 days to improve fruit setting.
Bud thinning is another key practice. It involves removing weak or stunted buds to allow the remaining flowers to receive more nutrients. This helps increase the size of individual fruits. Bud thinning is usually done from late March to late April, leaving about 2–3 buds per cluster. This technique is very effective in enhancing fruit size and quality.
After bud thinning comes fruit thinning, which further improves fruit quality. This is typically done in mid-May after the physiological fruit drop has occurred. Leave 3–4 fruits per short fruiting branch. Thinning helps reduce the load on the tree, allowing the remaining fruits to grow larger and sweeter.
When it comes to fruit coloration, it's important to remove leaves that shade the fruits and use reflective mulch under the tree to enhance light exposure. This helps the fruits develop better color. Also, during the coloring stage, it's advisable to install rainproof tents to prevent cracking caused by sudden rain.
Birds are often attracted to the ripening cherries, so it's crucial to protect the trees. Using netting is an effective method to keep birds away and ensure a good harvest.
By following these practices, you can significantly improve the yield and quality of your cherry crop. Let me know if you need further assistance!
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