-
Identification and Control Methods of the Tea Leaf-tier Moth
One of the boring pests of tea branches and trunks, also known as the tea branch sickle moth and tea stem borer, belonging to the order Lepidoptera, family Yponomeutidae (leaf-tier moths), with the scientific name Casmarapatrana Meyrick. It is distributed in all tea-producing provinces of China. Morphology: The adult has tea-brown body and wings, with a body length of 15-20mm and a wingspan of 32-40mm. The forewings are nearly rectangular, with a grayish-black outer margin, a large earth-yellow patch on the inner side, and a small red protruding spot near the center of the wing base. The egg is horseshoe-shaped, about 1mm long, and pale cream-yellow. The larva is slender, with a yellowish-white and slightly
-
Symptoms, Identification and Control Methods of Pinellia Leaf Spot
It occurs in early summer. Purple-brown spots appear on diseased leaves, and later many small black dots form on the lesions. In severe cases, the lesions cover the entire leaf, causing the leaves to curl, scorch and die. Control methods: In the early stage of the disease, spray 1:1:120 Bordeaux mixture or 65% zineb 500-fold solution, once every 7-10 days, for 2-3 consecutive applications.
-
What tree is the large-leaf red-flowered black locust? An introduction to its cultivar characteristics
The large-leaf red-flowered black locust is a multi-purpose black locust cultivar bred in Germany. In 1999, Professor Yang Minsheng of Hebei Agricultural University introduced it to China from the Institute of Forest Genetics and Forest Tree Breeding in Germany. After nearly 5 years of introduction trials and demonstration planting, it was proven that the large-leaf red-flowered black locust has strong adaptability, can grow normally in the suitable areas for black locust in North China, and has shown very high economic value. The large-leaf red-flowered black locust has a fast growth rate, with a diameter at breast height reaching 9.5 cm at 3 years old; a large leaf yield, with pinnate leaves 45-60 cm long, longer than tetraploid black locust
-
How to grow a large-leaf boxwood bonsai? Detailed explanation of shaping and care key points
Large-leaf boxwood is an evergreen shrub or small tree of the genus Euonymus in the family Celastraceae, also known as Zhengmu and evergreen euonymus. Because its leaves stay green all year round, it is also called "evergreen" or "large-leaf evergreen". Large-leaf boxwood can be processed into different bonsai forms such as straight-trunk style, slanting-trunk style, curved-trunk style, and double-trunk style according to the shape of the stump. The branches of young seedlings are soft and can be shaped from a young age. First wire the main trunk, then the main branches and side branches, and pay attention to promptly pruning excess branches. Because its leaves are relatively large, the crowns of small and medium-sized bonsai mostly use an elegant natural
-
How to prevent and control anthracnose and leaf spot on Japanese euonymus?
Japanese euonymus is commonly used as a hedge in gardens. It is drought-tolerant and tolerates pruning well, and has strong resistance to various toxic gases and smoke and dust. However, the occurrence of anthracnose and leaf spot causes the plants to drop leaves prematurely, or even die, seriously affecting the ornamental effect of Japanese euonymus. The two diseases often occur together, with two types of lesions on the same leaf, but they can be prevented and controlled together. 1. Anthracnose 1. Symptoms The disease occurs on leaves and young shoots. Leaf lesions are elliptical or round, about 3 to 12 mm in diameter. The lesion margins have a relatively narrow dark brown raised edge, with a grayish-white center.
-
Symptom Identification and Control Methods for Leaf Spot Disease on Japanese Spindle (Euonymus japonicus)
Symptoms: The disease affects the young and old leaves of Japanese spindle (Euonymus japonicus). Yellow-brown spots appear on the upper surface of the leaves and expand into nearly circular or irregular shapes, 4 mm to 14 mm in diameter, with a grayish-white center, light brown concentric rings, and a dark brown slightly raised edge. Dense tiny black mold dots form within the lesions. The spots show through to the underside, though the color on the underside is slightly lighter than on the upper surface. After the lesions dry up, they crack apart from the healthy tissue, eventually forming holes. This often causes early leaf drop. Pathogen: fungus, Cercospora destructiva Rav. of the order Moniliales, class Hyphomycetes, subdivision Deuteromycotina.
-
How to deal with leaf spot disease on Euonymus japonicus? Detailed explanation of prevention and control methods
Euonymus japonicus is a commonly used evergreen small shrub grown for its foliage in landscaping, and it has many advantages, but the occurrence of leaf spot disease causes the plant to drop its leaves prematurely, resulting in bare branches and even death, seriously affecting the normal growth and ornamental effect of Euonymus japonicus. Symptoms of leaf spot disease: In the early stage of the disease, there are small yellow spots on the leaves, which gradually turn yellowish-brown and expand into round or irregular spots. The diameter of the spots is 2 mm to 10 mm. In the later stage, the spots are grayish-brown or grayish-white with darker edges, and many small black dots grow on the spots.
-
What are the symptoms of leaf spot disease on Japanese euonymus?
Symptoms of leaf spot disease on Japanese euonymus: the disease occurs on new leaves, producing small yellow spots that later expand into irregular large spots up to 1.5 mm; the edges of the spots are raised, with a relatively wide brown margin, and beyond the raised edge there is an extended yellow halo. The center is yellowish-brown or grayish-brown and densely covered with small black dots. These are the stroma of the pathogen; under a magnifying glass, the dots appear as black downy tufts. In severe cases, the leaves drop off within the same year.
-
What are the key points of mulberry leaf feeding techniques in young silkworm co-rearing?
In the process of young silkworm co-rearing, mastering feeding techniques and ensuring proper nutrition is the key to ensuring young silkworms develop robustly and uniformly. Carefully select mulberry leaves according to the leaf standards for each instar, selecting in the field and selecting on the tree. Choose non-toxic, pollution-free, insect-free, appropriately mature leaves from the upper new shoots. Before leaf preparation, perform a second careful selection, removing leaves that are too old, too tender, wilted, or secondarily contaminated and thus below standard. Planned preparation and storage of leaves for young silkworms During leaf preparation and storage, keeping mulberry leaves fresh and with sufficient moisture is very important. Low-temperature running-water leaf storage
-
A Detailed Guide to Managing Wheat Seedlings Before Winter by Leaf Color
1. Causes of yellow leaves in wheat seedlings and their management. First, soil drought, which mostly occurs in wheat fields with insufficient subsoil moisture or where moisture escapes through cracks in the soil. Its characteristics are slow tiller emergence, grayish-green leaf color, short and small heart leaves, slow or stalled growth (known as "shriveled-heart seedlings"), gradual yellowing and drying of the middle and lower leaves, and few, thin roots. The key management point is to apply 15 kg of ammonium bicarbonate per mu along with irrigation. Second, nitrogen deficiency, in which seedlings are thin and weak and grow upright, tillering is reduced, leaves are narrow and short, and the lower leaves gradually turn yellow and dry starting from the leaf tips and progressing upward. The key management point is to use urea per mu
条件筛选