September winter jujube to prevent two diseases

In September, the winter jujube enters its late growth stage, and as the temperature difference between day and night increases, the fruit's sweetness begins to rise rapidly. However, based on years of experience, it is crucial not to neglect disease prevention during this critical period. As the fruit matures, the risk of various diseases also increases, requiring careful monitoring and timely intervention. One of the main concerns is the occurrence of rust. Normally, rust appears in early to mid-August, but by the later stages, the affected area tends to be more extensive, making control less effective. If no signs of rust are observed by late August, it may seem like the problem has been avoided, but this should not be taken for granted. Weather conditions play a significant role—prolonged rainfall in July and August leads to high humidity, wet surfaces, and increased fog, all of which contribute to an earlier and faster spread of the disease. Even if no symptoms are visible at the end of August, rust can still appear unexpectedly. Therefore, it’s essential to monitor weather changes closely and adjust preventive measures accordingly, depending on whether the climate is dry or humid. Another important issue is anthrax. There is often confusion in identifying anthrax, especially because similar symptoms can appear at different stages of fruit development. For example, small spots on the fruit with a pale yellow halo may look like anthrax, but they are usually caused by other bacterial infections rather than the actual anthrax pathogen. These cases are typically localized and cause minimal damage. However, true anthrax usually manifests when the fruit is nearly mature. The virus has a long incubation period, and early signs may be subtle—such as a yellowish water spot or faint red scratches that are easy to miss. If these symptoms are noticed, it could signal a widespread outbreak of anthrax. Once it occurs, the disease can severely affect the entire tree, causing leaves to wilt, fruits to rot, and even leading to total crop loss. In recent years, anthrax has been reported more frequently in some winter jujube regions, and it often occurs alongside jujube rust, making early identification challenging. This overlap can lead to misdiagnosis, so it’s important to remain vigilant. Moisture remains a key factor in the spread of anthrax, just as it does with rust. Prevention should focus on applying protective sprays during the early to mid-fruit development stages, while targeted treatments should be used in the later stages. In severe cases, bactericides may not be fully effective, highlighting the importance of early detection and proactive management. By staying informed and adapting strategies based on environmental conditions, growers can better protect their crops and ensure a healthy harvest.

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