The prevention and control of pests and diseases in spring plays a critical role in maintaining the health of fruit trees throughout the year. Spring is a key season when several common diseases and pests become active, making early intervention essential. The primary diseases observed during this period include powdery mildew, root rot, and brown spot, while the main pests consist of spider mites, nematodes, scale insects, gold thread moths, leaf roller moths, and chafers. Effective management strategies for these issues are crucial to ensure healthy growth and high-quality fruit production. Here are the main points to consider:
First, manual control measures are highly effective and should be carried out regularly. Begin by removing weeds and fallen leaves around the orchard, then either bury them deeply or burn them to prevent disease spread. From early March to the end of March, it's important to remove apple and pear rot as well as dry rot by scraping affected areas. Applying cibiqing or copper humate can help prevent these diseases from spreading further.
From late March to early April, carefully scrape the bark of mature apple and pear trees, removing any diseased spots on the branches and eliminating pests like spiders, aphids, and leaf roller moths that may have overwintered in the bark cracks. Also, prune branches of peach, plum, and apricot trees growing on the main trunk to improve air circulation and reduce disease risk.
Additionally, remove any remaining leaves at the top of apple and other fruit tree branches, and dispose of them through deep burial or incineration to eliminate overwintering pests such as tip leaf roller moths and red spider mites.
Second, chemical control methods are also essential. Before bud swelling, spray a 5-degree Baum lime sulfur solution to manage red spider mites, two-leaf locusts, and pathogens on the trunk. In orchards where leafhoppers caused significant damage the previous year, applying 2.5% Uranus EC once daily or using 3-degree Baum lime sulfur can be effective.
As buds begin to open, apply a 50% dichlorvos solution diluted 200 times to treat the branches and kill leaf roller moths. After budding and flowering, spraying 2.5% Uranus EC diluted 2000 times can effectively control leafhoppers, leaf roller moths, Pterophyllum caterpillars, and gold-grained moths.
If there is a heavy infestation of chafers, apply 4.5% Aldehyde powder or 3% phoxim granules (2–2.5 kg per mu) under the trees before flowering, and water it into the soil. For severely affected areas, applying 2000–4000 times diluted New Year Emulsifiable Concentrate has shown good results.
In early May, to combat early defoliation, anthracnose, ring rot, and pests like leafhoppers and leaf roller moths, spray 70% thiophanate-methyl at 800–1000 times dilution, combined with 2.5% Uranus EC at 2000 times dilution.
For plants showing symptoms of root rot, immediately dig a radial trench around the affected area and apply a treatment. A 10% double-effect Ling solution diluted 200 times or a 500 times diluted bacterial poison can be used. For adult trees, apply 50–75 grams per plant, and adjust the dosage for smaller trees accordingly.
By implementing these comprehensive strategies, orchard managers can significantly reduce the impact of pests and diseases in spring, laying a strong foundation for a successful growing season.
Organic Isomalto-Oligosaccharide 500 (tapioca) Powder
Organic Tapioca IMO,Low GI IMO,Organic IMO Isomaltooligosaccharide
Qingdao Bailong Huichuang Bio-tech Co., Ltd. , https://www.sdblcycn.com