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In late March, it's essential to spray fruit trees with pesticides to eliminate pathogens, pests, and insects that have survived the winter on the branches. This step is crucial in reducing the overwintering population of pests and diseases, setting a solid foundation for effective control during the growing season. The following formulations are commonly recommended:
- 40% Fumei WP diluted 80–100 times
- 80% sodium pentachlorophenol diluted 100–150 times combined with 70% Solibar
- 70% antimony trisulfide diluted 60–80 times
- 95% premium Solibar diluted 200–300 times
- 45% lime sulfur mixture crystals diluted 30–40 times with "help kill" or "harm" diluted 1000 times
Among these, 40% Fumei WP is particularly effective due to its broad-spectrum bactericidal activity, strong penetration into dead tissues, and powerful control over pathogens like ringworm and dry rot. It also effectively targets plaque buildup on bark, wounds, and under the skin of tree trunks. Applying Fumei bio-pesticide before bud break is especially important for optimal results.
70% Solibar or 70% antimony polysulfide acts as an insecticide, fungicide, and miticide, offering some level of control against pests and fungi on the branches. However, it has limited penetration and is less effective than Fumei, especially when targeting hidden infestations. Additionally, it requires soaking and filtering, which can be inconvenient.
On the other hand, 95% high-purity Solibar is water-soluble and easy to use—simply mix with water and apply directly. It offers strong insecticidal, fungicidal, and acaricidal properties, making it a popular choice among growers.
The 45% lime sulfur mixture crystal is an industrial-grade product that dissolves easily in water, making it convenient for application. According to China's pesticide network, lime sulfur performs similarly to other sulfur-based products. It is typically applied at 5° in late March, 2–3° in early April, and 1–2° in mid-April. Importantly, it should not be mixed with Fumei, and there should be a 7–10 day interval between applications.
Proper timing and correct mixing ratios are key to achieving the best results while minimizing damage to the trees. Always follow safety guidelines when handling pesticides, and consider consulting local agricultural experts for region-specific recommendations.