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Causes and Control Methods of Pear Black Heart Disease
In the early stage of the disease, brown patches appear on the outer skin of the fruit core. When the browning gradually expands to the entire core, the flesh shows browning with indistinct boundaries. Affected fruit deteriorates in flavor, seriously affecting the fresh-keeping storage life of Ya pears. Depending on the storage period and conditions, this disease can be divided into two types: early-stage black heart disease and late-stage black heart disease. The former occurs 30-50 d after being placed in cold storage and is considered to be caused by low-temperature injury during storage. The latter usually occurs under earthen cellar storage conditions, mostly around the Spring Festival of the following year, and is preliminarily considered possibly
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How to prevent and treat oleander black spot disease? Here are the methods
Symptoms The spots occur on the edges or middle of the leaves, semicircular or circular. When several spots join together, they form a wavy pattern, present on both the front and back sides, with the front darker than the back; the spots are grayish-white or grayish-brown; in the later stage, a black powdery mold layer develops on the spots, generally occurring on overwintering leaves. Pathogen The pathogen is a fungus, Alternaria sp. The conidia are olive-colored, oval, with both longitudinal and transverse septa, in chains, borne on relatively long conidiophores. Disease pattern Generally, old leaves, lower
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Black Beauty Eggplant
A newly bred first-generation hybrid specifically for protected cultivation, plant height 85 cm, plant type semi-upright. Early maturing, first flower node at the 9th node, fruit dark purple, long strip-shaped (33x3.5 cm), single fruit weight over 150 g. Fruit skin glossy, coloration uniform, good consistency. Strong fruit-setting ability under low-temperature conditions, good coloration under weak light, high marketable fruit rate, excellent market quality. Suitable for early spring or overwintering cultivation in plastic tunnels or solar greenhouses; in the Yangtze River Basin, generally sown from late September to early October and transplanted in early to mid-November, with multi-layer covering cultivation.
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Introduction to the Black Sweet Potato Variety Black Potato King No. 1
This variety is a new high-yield black sweet potato variety recently introduced from Hong Kong, China by the Guangdong Institute of Biotechnology. The vines grow about 1.3 m long. It sets tubers early and in a concentrated way. The tubers are spindle-shaped and contain 24-26% starch. The skin is purple-black and the flesh is jet black. When cooked, it is richly aromatic, soft, sweet, mealy and sandy, and is rich in selenium and iodine. It yields about 80% more than Chuanshan Purple, with a yield of 3000-7000 kg per mu and 3000-3500 plants planted per mu.
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A Detailed Guide to the Identification and Control Techniques of the Black Velvet Chafer
The black velvet chafer is commonly known as the "blind bumper" or "big velvet mandarin jacket." It mainly damages soybean seedlings in its adult form (the chafer), biting the growing points or severing young stems. When outbreaks are severe, it can eat the seedlings bare, causing missing plants and broken rows, or even ruining the field. This insect has one generation per year, overwintering as adults in the soil, and occurs more often in fields following soybeans. From late April to early May, it first feeds on weeds; after soybean seedlings emerge, it bites the soybean seedlings. At night this insect hides in the soil and comes out during the day to cause damage. It feeds most heavily from 3-5 pm, and the number of insects is greatest on windless, warm days. Control methods: 2.5
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Many holes and black spots on new cotton leaves? Watch out for tarnished plant bug damage
A text message from mobile phone 139****8164: There are many small holes and many small black spots on the new cotton leaves. What is going on? What pesticide should be used? Answer: It is very likely caused by the piercing-sucking damage of the tarnished plant bug. When the tarnished plant bug pierces and sucks at the growing point at the top of the cotton plant, it causes tissue necrosis and forms needle-point-like black spots. Later, as the healthy tissue grows, irregular holes form in the leaves (their edges heal well, which distinguishes them from perforation caused by disease). The tarnished plant bug is a pest that occurs frequently and in large numbers in cotton production in recent years,
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Common problems and countermeasures during the black fry stage of Japanese eel
At the turn of spring and summer, Japanese eel farming in various regions is mostly in the black fry stage, and it is commonly reported that there are phenomena such as a decline in feeding rate and a tendency for gill rot and tail rot syndrome to occur, seriously affecting the healthy, sustainable, and steady development of Japanese eel farming. The main problems existing in the black fry stage of Japanese eel farming are now analyzed, and some corresponding countermeasures are proposed for reference. 1. Decline in feeding rate: In Japanese eel black fry farming, the phenomenon of a decline in feeding rate or difficulty in increasing the feeding amount occurs, and the main triggering factors are
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Characteristics and Key Cultivation Points of the American Black Hybrid Sweet Potato Variety
This variety is a cross between the American Black sweet potato and Shuangwanyi No. 1. The vines grow about 1.5 m long. The tubers are spindle-shaped, uniform and attractive, and set in a concentrated cluster. It yields 50-80% more than the American Black sweet potato and Japanese Chuanshanzi. The tuber skin is purple-black, and the flesh is purple-black with silvery-white netting. When cooked, the flesh turns jet black, fine and smooth in texture, with a sweet fragrance and a mealy, sandy taste. It is rich in selenium, an anti-cancer element. Yield is 3000-6000 kg per mu, with 3000-3500 plants per mu.
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How is Batai Black Fragrant Rice? An introduction to its variety characteristics
Batai Black Fragrant Rice was bred by farmers in Zengcheng City through mutation selection from the progeny of Basmati treated with concentrated solar radiation. It was successfully bred in 1993 (only the seed source was retained, awaiting development). Production performance and rice quality characteristics: according to trial plantings, this variety yields 275-350 kg per mu, and can reach 400 kg under high-yield cultivation. The grain surface is deep black in color, and the grains are slender. It is a fragrant, soft-textured rice, containing essential trace elements, amino acids, vitamins and plant sterols
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New Black Sweet Potato Variety: Introduction to the American Ultra-Short-Vine Black Sweet Potato
1. Characteristics: ① Excellent appearance: The tubers are long and cylindrical, with a single tuber weighing 300-800 grams, and the largest around 1000 grams. It sets many tubers evenly, with 4-8 tubers per plant. The tuber surface is purple-black, glossy, and attractive. ② Excellent quality: Its nutrient content is significantly higher than other tuber crops. Its lysine, potassium, manganese, and zinc contents are 5-8 times higher than ordinary sweet potatoes, and in particular, its content of the anti-cancer substances iodine and selenium is more than 20 times higher than other sweet potatoes, ranking first among foods. For this reason, it is hailed in the United States as a "green health food." ③ Excellent eating quality: When cooked, it is sweet, fragrant, and palatable.
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