-
Proper removal of silkworm excrement can effectively reduce the occurrence of silkworm diseases
Silkworm excrement not only harbors the pathogens of viral flacherie, but is also a breeding and transmission site for the pathogens of many silkworm diseases such as empty-head soft rot, bacterial soft rot, and muscardine. Data show that when pathogen-carrying silkworm excrement from spring-reared silkworms is left for 15 days and then comes into contact with mulberry leaves, it can cause the incidence of midgut-type viral flacherie in silkworms that eat those leaves to reach 75%; when pathogen-carrying silkworm excrement from late-autumn-reared silkworms is left for 1 day and then comes into contact with mulberry leaves, it can cause the incidence of midgut-type viral flacherie in silkworms that eat those leaves to reach 60%, and after 7 days the incidence reaches 100%. Therefore, during routine rearing,
-
Occurrence Patterns and Control Methods of Potato Blackleg in Heilongjiang Province
Blackleg occurs to varying degrees in all potato-growing areas. The plant infection rate ranges from 2%-5% in mild cases to 40%-50% in severe cases, often causing missing plants, broken rows, and seed potato rot in the field. In recent years, the damage caused by this disease in our province has shown a trend of increasing year by year, greatly reducing the quality, yield, and marketable potato rate of potatoes. To effectively prevent this disease, it is necessary to accurately identify its symptoms, clearly understand the occurrence patterns, and master integrated control techniques. 1 Symptom Identification 1.1 Disease Symptoms Blackleg can occur throughout the entire growth period, mainly affecting stems and tubers.
-
Rice Major Pests and Diseases in Gejiu City: Occurrence and Control Methods
I. Rice Planthoppers 1. Damage characteristics: Rice planthoppers, also known as white gnats, are migratory pests with the characteristics of long-distance migration and outbreak damage. The common species include the smaller brown planthopper and the white-backed planthopper. They occur in all rice-growing areas of the city, mainly damaging rice, followed by wheat and corn, and also parasitize grasses such as Chinese sprangletop and other gramineous weeds. Adults and nymphs gather in clusters at the base of rice clumps and on leaves to suck sap. The damaged parts show elongated brown spots, and in severe cases the lower stems turn black and the entire plant dies.
-
Detailed Explanation of the Occurrence Characteristics and Control Techniques of Spider Mites on Soybean
The soybean spider mite is the carmine spider mite (Tetranychus cinnabarinus), belonging to the class Arachnida, order Acariformes, family Tetranychidae. In 2007, affected by high temperatures and drought, soybean spider mites broke out over an area of 120 million mu in Heilongjiang Province, causing severe soybean yield reductions. According to surveys, in recent years the damage from soybean spider mites has risen to a primary position, generally reducing soybean yields by 20-30%, and in severely affected plots by 70-90%. I. Morphological characteristics. The adult body length is 0.3-0.5 mm, reddish-brown, with 4 pairs of legs. The female mite body length is 0.5 mm, egg-shaped or pear-shaped, slightly broad and raised at the front end, slightly pointed at the tail, with fine long setae on the dorsal surface, and one black elongated patch on each side of the dorsum; overwintering females are vermilion red and glossy. The male body length is 0.3 mm, purplish-red to light yellow, spindle-shaped or pear-shaped. The egg diameter is 0.13 mm, spherical, colorless and transparent when first laid, gradually turning yellow with red. The larva has 3 pairs of legs, a round body, yellow-white, becoming egg-shaped and light green after feeding, with dark green elongated patches appearing on both sides of the dorsum. The nymph has 4 pairs of legs, light green to pale orange-yellow, with setae appearing on the dorsum.
-
Occurrence and Control of Stem Base Rot in Schisandra
Stem base rot in Schisandra can cause the stem base of the plant to rot, the root bark to fall off, and eventually the entire plant to die. With the expansion of cultivated area, the occurrence of stem base rot in Schisandra has shown an upward trend. The general incidence rate is 2%-40%, and in severe cases it exceeds 70%, making it a devastating disease. 1. Disease symptoms Stem base rot occurs on Schisandra of all ages, with 1-3 year old plants being the most severely affected. The disease starts from the stem base or the junction of root and stem. In the early stage of the disease, the leaves wilt and droop as if lacking water, but cannot recover,
-
Occurrence and Control of Pests and Diseases in Industrialized Mushroom Cultivation
In the late 1990s, China successively introduced industrialized mushroom production lines from Japan and the Taiwan region, which led to rapid advances in mushroom production technology, making it possible to enjoy delicious and nutritious fresh products such as enoki mushrooms (Flammulina filiformis), crab-flavored mushrooms (Hypsizygus marmoreus) and king oyster mushrooms (Pleurotus eryngii) even in the hot summer. In the Shanghai area, there are currently 3 large-scale enoki mushroom enterprises in production and 1 crab-flavored mushroom enterprise, with 3 more added by the end of 2005. It is expected that the daily output of enoki mushrooms will reach 50 t, crab-flavored mushrooms 5 t and king oyster mushrooms 1.5 t, making it the largest industrialized mushroom production base in the country.
-
Occurrence and Control Methods of Withering Tail Disease in Snakes
Diagnosis: Withering tail disease is generally a complication arising from spleen and stomach dysfunction that has not been treated in time. It often presents as emaciation, loss of appetite, shriveling and wrinkling of the tail, and then drying up. Treatment: mainly strengthening the spleen and benefiting the stomach. For traditional Chinese medicine, decoct Amomum villosum (spring amomum), Aucklandia lappa (costus root), Codonopsis pilosula, Atractylodes macrocephala, Poria cocos and Glycyrrhiza uralensis in water and administer orally. For Western medicine, glucose, compound vitamin B liquid, etc. can be administered orally. Inject vitamin B12.
-
How to control the cupreous chafer? Master its occurrence patterns and key control points
The cupreous chafer beetle belongs to the order Coleoptera, family Scarabaeidae. It occurs in many apple orchards in our region, and its hosts include apple, hawthorn, crabapple, pear, apricot, peach, plum, Japanese apricot, persimmon, walnut, strawberry, and so on. I. Damage symptoms: Apple trees suffer the most severe damage from the cupreous chafer beetle; the adults feed on leaves, often causing large areas of young fruit trees to have incomplete leaves, and even entire trees stripped of all leaves. II. Occurrence patterns: (I) The cupreous chafer beetle has 1 generation per year, overwintering as mature
-
How to prevent and control jujube fruit shrinkage disease? Understanding the occurrence pattern is key
Jujube fruit shrinkage disease, also known as jujube iron skin disease, jujube black rot, jujube dry waist fruit shrinkage disease, jujube wilt fruit disease, wu chao, wu luo tou, wu chao, tie jiao, etc., was first officially reported in China in the late 1970s. It is found throughout all major jujube-growing regions nationwide, and its damage is becoming increasingly severe, having already become a devastating disease in jujube production. In recent years, the disease has become increasingly serious in jujube-producing areas of Shanxi Province, becoming an important factor affecting jujube yield and commercial quality. However, current reports on the pathogen and control patterns of this disease are inconsistent, and no effective control method has been found
-
Occurrence Patterns and Control Methods of Major Tea Plant Pests During the Summer Tea Season
Due to the low-temperature rain and snow weather last winter and this spring, the overwintering generation of tea pests this year had a low population base and a delayed occurrence period, and damage during the spring tea season was relatively light. However, summer weather is more suitable for the occurrence and damage of pests and diseases, so monitoring and control work must be carried out effectively. The occurrence level of the camellia spiny whitefly was lighter than last year, but pest numbers in some tea gardens still exceeded the control threshold. According to a survey by the Songyang County Plant Protection Station: the peak period of overwintering adult camellia spiny whiteflies was April 15, with an average of 17.4 insects per 100 leaves, later and fewer than last year (April 5).
条件筛选