Method for promoting normal fruit bearing of lemon tree with citrus limon yellow vein clearing viruses

Abstract

The invention provides a method for promoting the normal fruit bearing of a lemon tree with citrus limon yellow vein clearing viruses. The method includes the following steps that: (a) after the shoots of the lemon tree germinate in each spring, and a pesticide is sprayed once onto the whole tree when the 40-60% of the leaves of the shoots initially unfold, the spring shoots and flower buds of thewhole tree are sprayed with the pesticide during days without rain, so that the spring shoots and flower buds can be withered due to dry, wherein the pesticide comprises 500-1000mg/kg of sodium naphthalene-1-acetate, 25-100mg/kg of fluoroglycofen-ethyl, 40-120mg/kg of lactofen, and 0.004%-0.006% of d-limonene, and the pH of the solution is adjusted to 4 to 5; (b) when the length of 40 to 60% of the germinated summer shoots of the lemon tree is larger than or equal to 10 cm, 40-60g of urea is sparsely sprayed near the canopy drip line of the lemon tree, the urea is prepared into a 0.5% solution so as to be poured onto the lemon tree in days without rain; (c) 15 to 20 days after the urea is applied, 300 to 500g of a nitrogen-phosphorus-potassium mixed fertilizer is sprayed near the canopy drip line of the lemon tree, and the nitrogen-phosphorus-potassium mixed fertilizer is prepared into a 1% solution so as to be applied onto the lemon tree in days without rain. With the method of the invention adopted, the time of the sprouting of shoots and the germination of flower buds can be controlled, the growth of the lemon tree can be delayed, so that the summer shoots of the lemon tree cansend forth, and the flowering and fruiting of the lemon tree can be also correspondingly delayed, and therefore, the harm of the citrus limon yellow vein clearing viruses can be effectively reduced,and high yield and quality can be ensured. The method is of great practical significance and application value for lemon production areas stricken with the citrus limon yellow vein clearing viruses.

Description

technical field [0001] The invention belongs to the field of fruit tree cultivation, and in particular relates to a method for promoting normal fruiting of lemon trees with yellow vein disease. technical background [0002] Citrus yellow vein disease is a new citrus disease caused by Citrus yellow vein clearing virus (CYVCV). The disease was first discovered in Pakistan in 1988, and then similar symptoms were observed in India, Turkey and other places. In China, the disease was first discovered and confirmed in Ruili, Yunnan in 2009. According to the identification of molecular markers, citrus yellow vein disease is currently distributed in many major citrus producing areas such as Yunnan, Sichuan, Chongqing, Guangxi, Guangdong, Jiangxi and Fujian. Citrus yellow vein disease can infect most citrus plants such as lemons, citrons, limes, limes, and sweet oranges. Most varieties are asymptomatic, but in lemons, limes, and 'DeWitt' Symptoms on the surface are very obvious. The...

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Problems solved by technology

Although the occurrence of yellow pulse disease in China is very short, it is developing rapidly. Experts and technicians have just found out the law of its occurrence, and fruit farmers have not yet had a deep understanding of the harmfulness of th

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