[Symptoms] The gray spot disease mainly damages the leaves of loquat, and the fruits may also be damaged. Leaf lesions are round or near-circular, smaller, and 2-4 mm in length, with brown spots on the edges. After the onset of disease, the healthy parts are clearly demarcated, and the middle part is gray-brown to gray-white. The signs on the surface are dark grey mold (diseases). Sporophytes and conidia), with leaf surface markings as obvious. The fruit is infected and the symptoms are similar to the leaves, but the brown spots sometimes sink slightly.
[Pathogen and pathogenesis characteristics] Gray spot disease caused by the infection of Cercospora lycii Ell. et Halst. of the subphylum of the genus Deuteromycete. The pathogens are either on the diseased plant or on the diseased plant with mycelia and spores. The remains are left over in the soil for wintering, or wintering with conidia adhering to the fruit seeds. Conidia are used as primary inoculation and re-invasion bodies, and they spread through wind and rain and invade the parasitic epidermis. High humidity and rainy years are conducive to disease. Planting land is low and damp, poor soil fertility or poor fertilizer and water management cause poor plant growth, or partial nitrogen fertilizer plants are excessively prosperous. Both of them are easy to reduce plant resistance and are susceptible to diseases. Differences in disease resistance among breeds are still missing.
[Control methods]
(1) According to local conditions and introduction of disease-resistant seed varieties, there are two types of pods cultivated in China: one is leaf cultivars (including leafhoppers and big leafhoppers), and the other is leaf cultivars, which are mainly used as vegetable cultivation. In Guangdong and Guangxi, breeding with cuttings, generally not flowering and seeding (mostly cultivated in South China in January-January, the Yangtze River, Yellow River Basin cultivation in March inserted); one for medicinal wolfberry (or Ningxia枸æž), mainly for the collection of seeds and root bark for medicinal purposes, mainly distributed in Ningxia, Inner Mongolia and other places for the cultivation of perennial deciduous shrubs. In recent years, the United States has been introduced into the United States (fruit is big, fruit is dense, and seeds are few). All localities should introduce trial species in accordance with local conditions and strengthen observation and investigation so as to select disease-resistant, high-yielding varieties suitable for local needs as soon as possible.
(2) Strengthen the management of fertilizer and water, make it densely planted, promote strong plants but not over-prosperity, stabilize growth, and strengthen resistance.
(3) For foliar use, combined with leaf mold control, spraying 56% of the horizontal dispersant 800-1000 times, or 50% of 800-1000 times, or 65% of the gram-wet powder 600 Doubling, or 70% Kofu WP can be 800-1000 times liquid, 2-3 times, every 7-15 days, alternately, before close dense.
[Pathogen and pathogenesis characteristics] Gray spot disease caused by the infection of Cercospora lycii Ell. et Halst. of the subphylum of the genus Deuteromycete. The pathogens are either on the diseased plant or on the diseased plant with mycelia and spores. The remains are left over in the soil for wintering, or wintering with conidia adhering to the fruit seeds. Conidia are used as primary inoculation and re-invasion bodies, and they spread through wind and rain and invade the parasitic epidermis. High humidity and rainy years are conducive to disease. Planting land is low and damp, poor soil fertility or poor fertilizer and water management cause poor plant growth, or partial nitrogen fertilizer plants are excessively prosperous. Both of them are easy to reduce plant resistance and are susceptible to diseases. Differences in disease resistance among breeds are still missing.
[Control methods]
(1) According to local conditions and introduction of disease-resistant seed varieties, there are two types of pods cultivated in China: one is leaf cultivars (including leafhoppers and big leafhoppers), and the other is leaf cultivars, which are mainly used as vegetable cultivation. In Guangdong and Guangxi, breeding with cuttings, generally not flowering and seeding (mostly cultivated in South China in January-January, the Yangtze River, Yellow River Basin cultivation in March inserted); one for medicinal wolfberry (or Ningxia枸æž), mainly for the collection of seeds and root bark for medicinal purposes, mainly distributed in Ningxia, Inner Mongolia and other places for the cultivation of perennial deciduous shrubs. In recent years, the United States has been introduced into the United States (fruit is big, fruit is dense, and seeds are few). All localities should introduce trial species in accordance with local conditions and strengthen observation and investigation so as to select disease-resistant, high-yielding varieties suitable for local needs as soon as possible.
(2) Strengthen the management of fertilizer and water, make it densely planted, promote strong plants but not over-prosperity, stabilize growth, and strengthen resistance.
(3) For foliar use, combined with leaf mold control, spraying 56% of the horizontal dispersant 800-1000 times, or 50% of 800-1000 times, or 65% of the gram-wet powder 600 Doubling, or 70% Kofu WP can be 800-1000 times liquid, 2-3 times, every 7-15 days, alternately, before close dense.
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