How to distinguish between these two diseases on tomato?

Botrytis cinerea and leaf mold are two common diseases in tomato production, both of which are caused by fungi. Friends who do not often grow tomatoes may find it difficult to distinguish between the two diseases. Here, I would like to share the difference between the two and the methods of prevention and control.

Grey mold disease

Differences in hazard characteristics:

Botrytis cinerea can harm flowers, fruits, leaves and stems. The disease of green fruit is the most serious, from the residual flower and receptacle to the fruit or stalk, the pericarp becomes gray and water-soaked, then it becomes soft and rotten, the rotten fruit grows gray mold layer, and the fruit produces stiff fruit after losing water. Leaf disease spot is mostly V-shaped expansion from the edge, initial water immersion, light brown, irregular edge with deep and shallow wheel lines, long gray mold, when the leaf dies seriously. The stem was infected with disease, showing a small flooding spot at first, then growing oval or long strip-shaped spot, and growing a grayish-brown mildew layer when the humidity was high, and gradually withered.

Tomato leaf mold mainly harms leaves and sometimes stems, flowers and fruits. The leaves are infected with irregular or oval light yellow spots. The primary white mildew layer on the back of the leaves is also connected to each other into pieces, and the color changes from white to grayish purple or dark green.

The two conditions are not consistent. Botrytis cinerea has strict requirements for humidity and is easy to occur under high humidity conditions. Tomato leaf mold is easy to occur under high temperature and high humidity conditions.

Leaf mildew

Differences in prevention and control measures:

Prevention and control measures of Botrytis cinerea: strengthen ventilation management, appropriate watering during the disease period to prevent dew. After the onset of the disease, remove the diseased fruit, diseased leaves and lateral branches in time, and burn them or bury them deeply. Critical period medication: before planting for the first time, spray the seedlings with 1500 times liquid of 50% Pythalide wettable powder. Take the medicine when you touch the flower for the second time, and add 0.1% 50% promethazol wettable powder to the prepared 2jin4murd or anti-ascorbic acid diluent to stain or smear the flower, so that the flower organ carries the medicine. For the third time, the medicine was used the day before the fruit water was poured. The tomatoes in the shed were initially fumigated with 3% cinnamon and smoke agent, with 2250g per hectare or 45% chlorothalonil for one night, once every 7 to 8 days. In addition, 1500 times of 50% Prometholide wettable powder was sprayed at the beginning of the disease.

Prevention and control measures of leaf mildew: timely ventilation, control watering, timely moisture drainage after watering, proper close planting and timely pruning and branching, less application of nitrogen fertilizer, increased application of phosphorus and potassium fertilizer, and organic fertilizer should be matured at high temperature. Before planting, fumigate the greenhouse, 250g sulfur powder per 100 square meters, add 500g sawdust, mix well and light up, then seal the greenhouse overnight. At the beginning of the disease, 50% carbendazim or metoprolol wettable powder was sprayed 500 times, BO~10 water agent 100,150 times or 2% Chunramycin liquid 200mg/L, once every 7 days, 2 times for 3 times.