Currently, citrus fruits are in the early stage of fruit development, showing vigorous growth. However, due to a prolonged period of heavy rainfall, the canopy shade in orchards is relatively thin, leading to weaker tree growth. This makes young fruits more vulnerable to anthracnose, with an expected severity level of 3-4. The orange leaf miner is also expected to reach a moderate level of infestation, around degree 3.

Second, the main basis

According to surveys conducted in mid-July, the disease rate of young blight anthracnose was recorded at 1.3%, and the incidence across orchards ranged between 5% and 8%. Anthracnose has been prevalent in citrus production areas throughout the winter and into the current spring season. There has been a noticeable increase in abnormal leaf drop, indicating a high disease source. Under favorable weather conditions, this can lead to widespread outbreaks. Therefore, it's crucial to strengthen monitoring and implement timely control measures.

Third, the main measures

1. During rainy or heavy rainfall periods, it's recommended to use protective agents that are easy to apply, provide long-lasting protection, and effectively reduce young fruit infections. A concentration of 1000 times is typically effective for such applications.

2. For treatment, thiophanate-methyl from Japan is highly recommended due to its effectiveness against anthracnose.

3. Apply these treatments on sunny days, and consider mixing them with high-quality potassium-based foliar fertilizers. This helps improve the physiological functions of the trees and enhances their resistance to environmental stress.

4. Ensure proper drainage by digging trenches to prevent waterlogging, which can exacerbate disease problems.

5. For controlling leaf miners, it's advisable to alternate between chlorpyrifos and BT (Bacillus thuringiensis) formulations. These combinations have proven effective in managing infestations and reducing damage to citrus crops.

In summary, proactive management and regular monitoring are essential to mitigate the impact of pests and diseases during this critical growth phase. By following these recommended practices, growers can significantly improve the health and productivity of their citrus orchards.

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