-
How to prevent pumpkin leaf spot? Mastering these methods is key
Pumpkin leaf spot mainly damages leaves and flower stalks. The pathogen overwinters in the soil with diseased plant debris. In spring, the pathogen spreads via splashing rainwater. In the early stage of the disease, leaf spots are round to nearly round or irregular in shape. The leaf margins are dark brown, and the junction between diseased and healthy tissue appears water-soaked. When humidity is high, dense small black dots form on the spot surface, and in severe cases the leaf spots merge, causing the leaves to partially...
-
Greenhouse Bean Disease Prevention and Control Methods and Key Technical Points
I. Symptoms of bean rust: It mainly affects the leaves, and in severe cases also affects the petioles and pods. In the early stage of the disease, small pale yellow spots appear on the underside of the leaves, later turning rusty brown, raised and forming small pustule-like blisters, then expanding into uredinia, and after the epidermis ruptures, reddish-brown powder is released. This is the urediniospore. II. Bean powdery mildew...
-
How to prevent and control jujube anthracnose? Sharing practical methods
1. Symptoms: Infected fruit first shows red-brown spots, after which the lesions gradually enlarge, surrounded by a pale yellow halo; finally the lesion color turns dark brown, slightly sunken but then expanding slowly, and the lesion shapes are diverse, including round, oval or spindle-shaped. The flesh inside the lesion gradually changes from green to brown, becomes necrotic,...
-
Grape Disease Prevention and Control Methods in the Rainy Season
Grape downy mildew is one of the important diseases of grapes and can occur in all parts of our country. It mainly damages the leaves, causing early defoliation, and can also harm new shoots and fruit clusters. The main symptom is the formation of polygonal yellow spots on the upper surface of the leaves, which later die, turn brown, and produce white downy mildew on the underside. Grape downy mildew...
-
How to Prevent Flower Drop in Oil Beans? Detailed Practical Control Methods
In snap beans, flower drop occurs under adverse conditions such as high temperatures above 30°C or windy weather, soil that is too dry or too wet, insufficient nutrients, and weak light, so field management should be strengthened to prevent flower and pod drop. Trials have shown that applying biological potassium fertilizer can reduce the occurrence of flower and pod drop.
-
How to prevent and control white rot of grapes during the rainy weather of the ripening period
White rot is one of the major diseases of grapes, especially in old vineyards where continuous rainy weather when the grapes are about to ripen leads to severe infection, often causing considerable losses. Grape white rot generally begins to develop in mid-to-late July, mainly harming the fruit clusters and new shoots, and the fruit is more susceptible once it enters the ripening stage. When fruit clusters are infected, it mostly occurs...
-
Grape disease and pest prevention: using these three sprayings well is the key
1. Peeling. In early spring, first lay a layer of plastic film under the grapevines, then peel the bark off the canes and let it fall onto the film; at the same time cut off diseased and pest-infested branches, gather them together with the bark scraps on the film and burn them outside the vineyard. 2. Deep plowing. Along with applying the grape bud-break fertilizer, carry out one deep plowing of the whole vineyard, with a depth of 2...
-
For high yardlong bean yields, preventing the pod borer is key
The adult pod borer moths lay eggs on the tender leaves of the plants. After 5-7 days, the hatched larvae bore into the pods and feed on the beans. Once larvae past the 3rd instar have bored into the pods, spraying pesticides can hardly kill them. Therefore, to control this pest, fertilizer and water management should be strengthened to ensure uniform growth and a relatively concentrated flowering and pod-setting period, so that in the critical period the pest can be...
-
How to prevent fruit abortion in greenhouse zucchini
Water-soluble fertilizer is a type of fertilizer suitable for application with irrigation water, and its nutrient components have good water solubility. Some of these products are formulated according to the nutrient requirements of zucchini, making them dedicated fertilizers for zucchini. These fertilizers generally contain not only nitrogen, phosphorus and potassium nutrients, but also boron, zinc, iron, calcium, magnesium and other medium and trace elements needed by crops...
-
What causes zucchini fruit abortion? Early spring greenhouse prevention and control measures
In early spring zucchini cultivation in greenhouses, the fruit is prone to stopping its expansion midway, turning yellow, and wilting. Eventually it becomes shriveled; this symptom can appear both before and after flowering, and is commonly known as fruit abortion. The causes of fruit abortion are as follows: 1. In early spring cultivation, the assimilation capacity of the leaves declines, and the plant accumulates less through photosynthesis. 2. Due to...
条件筛选