More and more symptoms of infection caused by Phytophthora infestans appear on tomatoes and potatoes in southwest Florida.
Experts say weather forecasts for the next few days will contribute to the development of the disease - foggy mornings, wet and rainy weather (high humidity - about 90%). Under such conditions, the pathogen can multiply rapidly and can easily destroy a tomato or potato field if it is not sufficiently controlled by an agronomist.
Symptoms of the disease on the leaves appear in the form of uneven brown spots that are located on the edges of the leaves. In the case of high humidity, a pale gray coating of conidial spores appears on the underside of the infected leaves.
Currently, fungicides remain the most effective crop protection until resistant species emerge. Fungicides slow the rate of disease development in the field by creating a protective barrier on the leaves. However, the mere use of a chemical does not guarantee effective disease control. Product relative efficacy, range, and timing should be incorporated into protection strategies to maximize benefits. The working fluid must be well distributed, including on the underside of the sheet.
Since the disease can spread rapidly, producers must carefully monitor their fields with potatoes and tomatoes daily, especially if conditions favorable for the development of Phytophthora infestans prevail in the region. (Source: sadyogrody.pl)
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