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Identification and Control Methods of Soybean Cyst Nematode Disease
Soybean cyst nematode disease, also called "huolongyangzi" disease, is caused by nematodes parasitizing the roots of soybean. Diseased plants have poorly developed root systems, with a marked reduction in lateral roots, slow growth, stunted plants, yellowing stems and leaves, small pods with shriveled seeds, or no seed set, and even death of the entire plant. When diseased plants are pulled up and examined, many needle...
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Symptom Identification and Control Methods of Rice Blast Leaf Spot on Water Bamboo
Rice blast leaf spot is a major disease of water bamboo, widely distributed and commonly occurring, found in all water bamboo growing areas, with more severe incidence in summer and autumn, diseased plants often reaching 80%-100%, significantly affecting water bamboo production. [Symptoms] This disease mainly affects the leaves. The lesions initially appear as small brown necrotic spots, which later develop into nearly oval to spindle-shaped...
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Identification Methods and Control Techniques for Rice Sheath Blight in Water Bamboo
[Symptom Characteristics] Water bamboo blast, also known as water bamboo gray heart disease, mainly infects the leaves. Leaf lesions fall into 3 types: acute, chronic and brown spot. Acute-type lesions are round-dot shaped, dark green, with a grayish-green mold layer (conidiophores and conidia) on the back of the lesion that is relatively obvious; their appearance is a precursor to a water bamboo blast epidemic. Chronic-type lesions are nearly spindle-shaped, ...
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Symptom Identification and Spring Control of Watermelon Fruit Flesh Deterioration
Symptoms: When watermelon fruits are exposed to the scorching sun, the fruit surface temperature becomes very high, and the fruit tissue is scorched and necrosed, forming a dry scar. Cause: Sunburn is related to variety; varieties with dark rind color are prone to it. Secondly, in hilly areas where the soil is relatively poor, the plants have weak vegetative growth and few vines and leaves, and the disease occurs frequently when the fruits are exposed...
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Symptom Identification and Control Techniques for Lettuce Gray Mold
A reader from Jiangsu asks: what are the symptoms and control methods of lettuce gray mold? Answer: Lettuce gray mold mainly damages leaves and stems, and infection can occur from the seedling stage to the mature plant stage. Infection at the seedling stage. Leaves and young stems show water-soaked rot, with gray mold growing on the diseased parts. Leaf infection. It starts from the mature leaves near the ground...
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Symptom Identification and Control Methods for Kidney Bean Leaf Spot Disease
It mainly affects the leaves. The leaf spots are round or nearly round, mostly occurring at the leaf tip or leaf margin, with brown edges and a light brown to grayish-brown center; when humid, small black dots are scattered or arranged in concentric rings on the spots. Control methods: strengthen management inside the greenhouse (such as frequently applying foliar fertilizer such as Fengshou No. 1), especially controlling air humidity. Then there is chemical control, ...
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Identification and Control Methods for Pineapple Mealybugs
Pineapple mealybugs belong to the order Homoptera, family Pseudococcidae. Dysmicoccus brevipes is the most commonly seen species. The damage symptoms are caused by adults and nymphs feeding on the sap of pineapple rhizomes, leaves, fruits and seedlings. Affected leaves first show symptoms starting from the lower part, gradually fading upward to yellow and finally turning red-purple; in severe cases all leaves soften and droop...
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Symptom Identification and Control Methods of Sorghum Black Bundle Disease
Symptoms Sorghum black bundle disease is a vascular bundle disease, also known as tracheomycotic blackening disease. When symptoms appear on leaves, brown streaks form on the leaf veins, mostly presenting as large necrotic spots along one or both sides of the main vein, causing the leaves and leaf sheaths to turn purple or brown; in severe cases the leaves dry up, the stalks become slightly thicker, and branching occurs on the upper part of diseased plants. Cross-sectioning the diseased stalk...
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Symptom Identification and Control Methods for Sorghum Downy Mildew
Sorghum seedling blight - Symptoms: The disease can occur when sorghum grows to 4-5 leaves. It starts from the lower leaves and then spreads upward. Infected leaves develop purplish-red streaks that gradually merge, causing the leaves to gradually die from the tip, and the seeds turn very brown. Sorghum seedling blight - Pathogen: Known as Fusarium moniliforme, a fungus belonging to the subphylum Deuteromycotina. On PDA medium...
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Symptom Identification and Control Methods for Sorghum Head Smut
Symptoms The diseased plants are shorter than healthy plants. In the early stage of the disease, the ear sheath of the diseased ear is very tight, the lower part is swollen, and the flag leaf is upright; when peeled open, a white rod-shaped structure can be seen inside, namely the smut gall. The smut gall inside the sheath is initially small and finger-shaped, gradually grows larger, and later the middle part swells into a cylindrical shape and becomes relatively hard. During the development of the smut gall, the internal tissue changes from white to black, then...
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