Grey mold of tomato (Botrytis cinerea) – identify and control
The grey mold of tomato is a disease commonly found in tomato crops in greenhouses and solariums and less often in the field.
Symptoms. The attack occurs on all above-ground plant organs. The first symptoms usually appear on the leaves at the base of the plant. Greenish or yellowish-green spots appear on older leaves, which are necrotic and sometimes show concentric zoning.
On the surface of the attacked tissues in a more advanced phase of the disease, an abundant greyish fluff appears, representing the asexual part of the fungus, i.e. conidiophores with conidia. Conidiophores carried by air currents infect other plant organs (stems, fruit).
On stems, the attack is most often seen at the base of the plant, with deep spots appearing in the tissue. If they cover the stem all around, they cause plant death. Similar spots may appear at different levels of the stem and the plants wither above the area of attack.
The most severe form of the attack is on fruit. It looks like a moist, soft rot at the insertion site of the stalk. On its surface, conidiophores and grey conidia develop abundantly. Attacked fruits break off and fall to the ground.
The grey mold of tomato is transmitted from one year to the next by the resistant mycelium, and during vegetation, it spreads by conidia.
Prophylaxis. As preventive measures, it is recommended to collect and destroy attacked plants, use resistant varieties and hybrids.
During the growing season, specific fungicides against grey mold are applied.
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