It is the peak season of tomato growing in the greenhouse after the autumn. The occurrence of diseases and pests will directly affect the yield, quality and economic benefits of this tomato plant. The damages of tomatoes after the fall of the fall are mainly: leaf mold, late blight, etc.; insect pests mainly include: whitefly, leafminer and so on. The prevention and control methods are described below.
First, leaf mold
1. Symptoms. Leaf mold mainly damages the leaves and first develops from the middle and lower leaves. The front surface of the leaves has an irregular or elliptic yellowish chlorotic chlorotic spot, a primary white mold layer in the dorsal diseased part, and then turns into a dense gray-yellow gray moldy layer. In severe cases, the lesions can also grow black mold. As the disease progresses, the leaves are covered with lesions and the leaves gradually dry and curl. Severe disease also harms tender stems and fruit.
2. Control. 1 Agricultural control: The use of under-membrane irrigation, to reduce the greenhouse humidity, remove the old leaves, diseased leaves, increase ventilation and light; rational fertilization, increase phosphorus, potassium fertilizer, improve plant resistance to disease. 2Chemical control: In the early stage of disease, after the removal of diseased leaves, spraying control. With 50% carbendazim WP 500 times or 50% epothilon 1500 times or 70% thiophanate-methyl WP 1000 times, every 7 to 10 days, and even spray 2 to 3 times.
Second, late blight
1. Symptoms. The disease was infected at adult stage. Most of the disease was caused by the lower leaves first. The leaves or leaf margins first appeared dark green irregular water-stained lesions. After the expansion, they turned brown. The lesions were larger in size and the contour of the diseased part was not obvious. The entire diseased leaves died. When it is wet, a sparse layer of white mold grows in the diseased place; plant stems are affected and the lesions are long, dark brown, slightly sunken, and the tissue becomes soft; the damage of the tender stem can cause contraction and death, and it also grows white when wet. Mold layer. Most of the fruits were uncolored, and dark brown irregular lesions appeared on the skin. They gradually spreaded to the lower part of the skin and showed a moire pattern. There was no clear boundary at the periphery. The surface of the peel was rough, and the color was deep dark tan. When wet, a layer of white mold grew. .
2. Control. 1 Agricultural measures: destroy old leaves and diseased leaves, increase ventilation and light transmission, use drip irrigation under the membrane to reduce the humidity in the shed; grass mulberries should be covered as early as possible to prevent condensation at night, prevent diseases caused by high humidity, and increase the quality of organic fertilizers and Phosphorus and Potassium fertilizers enhance plant resistance. 2 chemical control: pay attention to early detection and early treatment. Timely removal of the central diseased strains, and then sprayed with 58% of D. Mn-Zn wettable powder 600 times or 72% DuPont-Ke Lu wettable powder 1000 times, once every 7 days, and spray 2 to 3 times; Humidity, shed indoor use 5% chlorothalonil powder dust spray or chlorothalonil smoke smoke control.
Third, whitefly
Physical control: 30-40 mesh pest control nets can be installed in the air outlets of the greenhouses and in and out the doorways. At the same time, yellow traps are hung in the sheds, generally about 30 pieces per acre. Chemical control: 25% Aktai water dispersible granules available 2000-5000 times spraying or showering, or 10% buprofezin EC 1000 times spray control.
IV. Leaf miners
Physical control methods are the same as above; Chemicals prevention and control: Spraying is controlled by 48% of Looseben EC 1000 times or 1.8% abamectin EC 2000 times.
Natural Active Monomer, extracted from natural plant. we are a professional manufacturer and exporter of herbal/plant extract in China, we built a very good relationship with customers from UAS,Europe,Asia,South America etc. we provide professional before and after sales support for our customers,
Hot Products AS BELOW:
Berberine Hcl
Rutin
Amygdalin
Chlorogenic acid
Kaempferol
Caicalin
5-HTP
Resveratrol
Quercetin
Lycopene
Diosgenin
Chrysin
Natural Active Monomer
Natural Active Monomer,Plant Ingredients,Extract Powder,Rutin Extract
Excellent Health Products Co.,Ltd. , https://www.sino-excellent.com