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Cotton red leaf blight is prone to outbreak after heavy rain, growers need to be vigilant
Recently, cotton regions have generally experienced heavy to torrential rain, and for cotton that has endured a long drought, red leaf blight is extremely prone to outbreak. Cotton red leaf blight is a physiological disease. It starts from the main stem growing point or the top of the fruiting branch, and generally develops from top to bottom and from outside to inside. The main stem withers and dies, but the dissected vascular bundles show no discoloration. The root system is thick and short, with few fibrous roots and poor development. The causes of cotton red leaf blight outbreaks are: first, extensive farming in cotton fields, resulting in poor cotton root development; second, cotton fields with poor drainage; third, excessive application of nitrogen fertilizer, vigorous cotton growth,
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A Detailed Guide to the Harm Caused by the Jujube Leaf Beetle and Its Control Methods
The jujube leaf beetle belongs to the order Coleoptera, family Chrysomelidae. The larvae and adults of this insect damage jujube leaves and tender shoots. In outbreak years, the leaves are eaten bare, leaving only the bare fruiting branchlets, which greatly affects yield. The peak damage period for this insect is from mid-April to mid-May. Both larvae and adults damage jujube leaves, tender shoots, flower buds and flowers. Control methods: spraying mainly for flower protection is the primary approach. During the occurrence period of larvae and adults, spray 90% trichlorfon at 1500 times dilution or deltamethrin at 1.5 ten-thousand to 1.6 ten-thousand times dilution; generally the insecticidal effect is very good.
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Symptoms and Control Methods of Spruce Leaf Rust
Spruce leaf rust is distributed in Sichuan, Yunnan, Gansu, Qinghai, **, Taiwan, China and other places. The disease damages Picea likiangensis, Picea asperata, Picea crassifolia, Picea brachytyla var. complanata, Picea linzhiensis, Picea schrenkiana and Picea obovata, etc. Symptoms: When buds are infected, the needles on the newly grown tender shoots turn yellow or orange-yellow, short and thick; orange-yellow cushion-like telia or blister-like aecia are produced on the diseased leaves; the diseased buds resemble a yellow flower, and soon the diseased leaves turn black and die. On infected 2-year-old leaves, parts turn yellow, and blister-like aecia or orange-yellow cushion-like
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Golden-leaf dawn redwood is a new and superior colored-leaf tree species
Dawn redwood (Metasequoia glyptostroboides) is the only surviving species of the genus Metasequoia in the family Cupressaceae. This species was once thought to be extinct, until it was discovered in 1941 in the Lichuan area of Hubei, China, and afterwards this plant was also found successively in the Wanxian area of Sichuan. In 1947, dawn redwood seeds were introduced to the Arnold Arboretum in the United States, and from there spread to botanical gardens around the world. In 1948, "dawn redwood" and its scientific name were formally named, and since then it has enjoyed great fame in China and even the whole
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Characteristics and Cultivation Methods of Greenleaf Schisandra
Medicinal name: Greenleaf Schisandra. Aliases: Neifengxiao, Xiaoxueteng, Guoshanfeng, Zizuan, Fengshateng. Chinese pinyin: luyewuweizi. Latin botanical animal/mineral name: SchisandraviridisA.C.Smith. Efficacy: dispels wind and invigorates blood; moves qi and relieves pain. Family and genus classification: Schisandraceae. Indications: rheumatic bone pain; stomach pain; hernia pain; irregular menstruation; urticaria; herpes zoster. Ecological environment: grows in forests, on hillside roadsides and by mountain gullies and streams at 250-1200m. Harvest
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Causes and Control Measures of Abnormal Leaf Color in Wheat Seedlings
After wheat is sown and emerges, various abnormal discolored seedlings often form due to the influence of natural conditions and cultivation practices. To facilitate management according to seedling condition and targeted treatment, they are described separately below. Causes of yellowing of leaves in yellow-leaf seedlings. First, soil drought. This situation mostly occurs in wheat fields with insufficient subsoil moisture or where moisture escapes through airy soil. Its characteristics are: slow tiller emergence, grayish-green leaf color, short and small central leaves, slow or stagnant growth (which farmers call "shriveled-heart seedlings"), gradual yellowing and withering of the middle and lower leaves, and few and fine roots. Key management points
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Timely Control of the Rice Leaf Roller Is Essential and Cannot Be Delayed
The rice leaf roller is one of the major rice pests in our province. Its larvae damage the leaves, turning rice leaves into a mass of withered white. Especially when it attacks at the booting or heading stage, it will cause a sharp decline in rice yield. This pest has seven generations a year, and the second-generation larvae are the most numerous and cause the most serious damage to early rice. If control is not timely, it will break out in a major outbreak during the heading period, causing incalculable losses. For forecasting the rice leaf roller, the appropriate control timing should be determined based on the forecast of the occurrence period. Based on past conditions, investigation should begin 4 days after the peak of the moth flight
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Introduction to the Characteristics and Planting Key Points of the Nine-Leaf Green Sichuan Pepper Variety
The nine-leaf green Sichuan pepper is named for having nine small leaflets on its petiole. It is a first-generation superior variety carefully bred by scientific and technical personnel in Jiangjin City, with the characteristics of fragrant fruit and pure numbing flavor. All its indicators are superior to currently known Sichuan pepper varieties, and its market price is 2--3 times that of other Sichuan pepper varieties. At present, Chongqing Municipality uses the nine-leaf green Sichuan pepper as the preferred tree species for returning farmland to forest. The nine-leaf green Sichuan pepper is a warmth-loving tree species and generally suffers cold damage at around -20°C. It is drought-tolerant and usually grows well in areas with annual precipitation of 600 millimeters; it is barren-tolerant and suitable for various
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Causes and Control Methods of Leaf Yellowing in Winter Red Fruit Bonsai
Winter red fruit flowers easily and has a high fruit-setting rate. Its fruits are entirely red, and the fruiting period can extend to the next year's flowering and leafing stage without dropping. It is an excellent variety for fruit-viewing bonsai and is deeply loved by the people. However, during cultivation, due to the limitation of pot capacity and other influences, the leaves often turn yellow and drop. The main causes of yellowing are as follows: Temperature. Winter red fruit prefers warm and humid conditions and likes light but not excessively strong light. Especially in hot summers, strong direct sunlight will make the air dry and raise the pot soil temperature.
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Which tree species in stump bonsai are suitable for leaf pruning?
Q: Which tree species in stump bonsai can have their leaves pruned, and what should be noted? A: There are many bonsai tree species suitable for leaf pruning, including Chinese elm (Ulmus parvifolia), Japanese bush cherry (Sageretia thea), ginkgo, Chinese wolfberry (Lycium chinense), red maple, pomegranate, Chinese hackberry (Celtis sinensis), banyan (Ficus microcarpa), and Chinese chaste tree (Vitex negundo), etc. The main benefits of leaf pruning on stumps are: 1. It can make the leaves smaller, which helps display the artistic effect of bonsai in shrinking a dragon into an inch. For example, after leaf pruning on Chinese chaste tree, the newly sprouted leaves can shrink to 1/5 the size of the original leaves; when the banyan has all its leaves and buds removed in early summer, under controlled water and sufficient sunlight, the new leaves can grow
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