TSWV Alert

Symptoms:

First symptoms manifest on stems and leaves, and in later stages, signs of the disease will appear on fruits.

Foliage and stems: Appearance of circular stains (about 5.0 cm in diameter) that quickly become necrotic.

Fruits: Scattered round halo-like spots that sometimes take a spiral shape.

Who Am I?

TSWV is a viral disease transmitted by the western flower thrips. The infection results in spotting and wilting of infected crops, reduced yields, and in a later stages it leads to plant death. TSWV is not seedborne.

Control Measures

Infected plants with tomato spotted wilt virus should be removed from the field and destroyed as soon as possible. Since the virus may have already spread before the symptoms appeared, focus should be on prevention and the usage of resistant varieties.

Growing inside Structures? Make an effort to keep the structure closed as much as possible and the nets free of holes.

Fighting the vector: Eliminating thrips should be the focus since it prevents the infection, and they are hard to kill. Generally speaking, when the thrips population is high, farmers experience a significant reduction in insecticide efficiency. This forces farmers to implement several consecutive spraying applications.

Methiocarb, Acrinathrin, Dichlorvos, and Formetanate

Spinosad-based products

Successful, commercially available enemies of thrips are of the genus Orius (“minute pirate bug”), omnivorous bugs in the Anthocoridae family.

Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides, and herbicides). It is the grower’s sole responsibility to keep track of the legal uses and permissions with respect to the laws in their country and destination markets. Always read the instructions written on labels, and in a case of contradiction, work in accordance to the product label. Keep in mind that information written on the label usually applies to local markets. Pest control products intended for organic farming are generally considered to be less effective in comparison to conventional products. When dealing with organic, biologic, and to some extent a small number of conventional chemical products, a complete eradication of a pest or disease will often require several iterations of a specific treatment or combination of treatments.

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