Celery "double rot" disease primarily refers to heart rot and black rot. Heart rot mainly affects the growing tip of the leaves, while black rot damages the roots and stems, posing a serious threat to celery crops. According to the **China Pesticide Network**, here are some effective measures for prevention and treatment.
First, let's understand the symptoms and damage caused by heart rot. This is a physiological disorder characterized by dark green leaves that eventually turn yellow and rot. The main causes include calcium and boron deficiency in the soil or prolonged cloudy weather. After rain followed by dry conditions, the roots struggle to absorb essential nutrients like calcium and boron, leading to this condition.
Black rot, on the other hand, typically starts at the base of the plant and may spread to the roots. Affected areas first appear grayish-brown, then progress to dark green or dark brown. Initially, the outer skin remains intact, but as the disease progresses, the inner tissue turns black. The surface becomes soft and slimy, causing the leaves to droop and wilt. In severe cases, the outer leaves rot and fall off, leading to the death of the entire plant. According to the **pesticide network**, these two diseases can cause significant losses or even total crop failure for farmers.
To prevent and manage these diseases, the following methods are recommended:
1. In the early stages of infection, you can use a mixture of 25% metalaxyl wettable powder diluted 1000 times, combined with Jingbo calcium (800 times) and boron fertilizer (1000 times). Alternatively, you can use 25% pyraclostrobin diluted 2000 times along with Jinyu Agricultural Vitality (750 times), or oxazolone (1500 times) mixed with Full Garden Green Leaf Fertilizer (1000 times). These combinations help effectively prevent the occurrence of the disease.
2. Once the disease has already developed, it is recommended to spray a mixture of 25% metalaxyl wettable powder (600 times) and 70% thiophanate (600 times), along with Jingbo calcium. Another option is to mix 25% pyraclostrobin with 64% mancozeb (1000 times) and Jinyu Agricultural Vitality (750 times). Apply the solution every 3 to 5 days, repeating the process 2 to 3 times to ensure effective control and prevent further spread.
By implementing these preventive and curative measures, farmers can significantly reduce the impact of double rot disease on their celery crops. It’s important to monitor the plants regularly and take action at the earliest signs of infection to protect yield and quality.
Electromagnetic Flow Meters,Electromagnetic Flow Meter,Electromagnetic Water Flow Meter,Intelligent Flow Meter
Jingsu Huaerwei Science and Technology Group Co.,Ltd , https://www.hewflowmeter.com