How does passion fruit stem rot do? How to prevent and cure?

Passion fruit is a perennial evergreen vine, but after industrial cultivation, the planting cycle in most areas is only 2-3 years or even one year, such as Guigang, Guangxi. The main culprit for this reason is the root rot of passion fruit stem. What about passion fruit stem rot? How to prevent and cure?

The occurrence of stem rot is closely related to the weak growth of the plant, the poor soil condition and the deterioration of the rhizosphere environment. After the disease, the base of the stem is soft, rotten and necrotic, resulting in damage to its physiological function and inability to transport nutrients, resulting in dead trees.

Therefore, in order to solve this problem faced by passion fruit, it is necessary to replenish nutrients for the tree at the same time of sterilization and treatment, rejuvenate the plant, enhance its disease resistance and stress resistance, and repair injured tissue. Recovery of conduction function should also be combined with comprehensive management, soil improvement and other measures.

First, why passion fruit is prone to stem rot

1. Passion fruit is a shallow root plant, its stem vine structure is soft, the root system is floating, and the base and root of the stem are easy to be injured, which hinders the absorption of nutrients, weakens the growth potential and leads to pathogen infection.

two。 Partial application of nitrogen fertilizer: lead to crop growth, deficiency of nutrients in the tree, weakening of disease resistance and stress resistance, excessive hanging of fruit: overdraft of nutrients in the tree, deficiency of nutrients left in the tree after fruit harvest and weakening of stress resistance, overwintering will make the tree injured and easily infected by bacteria.

3. Poor soil condition: soil viscous weight, consolidation, acidification, first, it is easy to breed the reproduction of harmful bacteria; second, it makes the plant root growth poor, weakening the ability to absorb nutrients, leading to the weakening of plant growth and poor disease resistance.

4. Continuous cropping: continuous cropping leads to a large accumulation of stem rot pathogens in the soil and increases the incidence rate.

2. control measures of stem rot of passion fruit

The main points of prevention and control of passion fruit stem rot: combination of treatment and maintenance, three-dimensional use of drugs, and soil improvement.

1. Combination of treatment and recuperation: early prevention, re-treatment; nutritional rejuvenation. Early prevention: to prevent early in the germination period, early growth is the period when crops are easy to be infected by pathogens, early drug control can kill pathogens in advance and reduce the incidence of disease. Re-treatment: from May to July (rainy, high temperature) is the high incidence period of passion fruit stem rot, in this high incidence period or initial symptoms by increasing drug concentration, shortening the interval between the use of drugs to re-treatment, one-time control of the disease. Nutritional rejuvenation: the stem base rot of passion fruit is directly related to the weak growth potential of the tree. The effect of crop health and immunity can be achieved by directly replenishing the crop, increasing the chlorophyll content of its leaves to enhance photosynthesis, enhancing the enzyme reaction and so on.

two。 Three-dimensional medication: after the disease, only smear or spray the tree can not reach the amount of medicine, need to be combined with spray, root irrigation and other ways of three-dimensional medication, to ensure that adequate intake, nutrition supplement in place

3. Improve soil: use biological bacteria and organic fertilizer to regulate soil, adjust acid-base balance, break hardening, remove salinization, improve rhizosphere environment, increase beneficial bacteria to inhibit the reproduction of harmful bacteria and promote root growth. Stem base rot is a soil-borne disease. Improving soil suppresses the occurrence of stem base rot from the root.

Specific operations:

The main results are as follows: (1) fertilization: more organic fertilizer and biological bacterial fertilizer are used to increase soil organic matter, keep soil fluffy and permeable, improve rhizosphere environment, benefit the survival of beneficial microflora and restrain harmful microflora.

(2) medication: Qingkulike, Liangguoan and Kuifuling belong to Chinese herbal medicine preparations. Through root irrigation, spraying and smearing, the tree can participate in its nutritional cycle after absorption, kill the pathogenic bacteria hidden in the phloem and the houttuynia cordata can repair the injured tissue, open the conduction function of vascular bundles, block the invasion of pathogens, and also contain polysaccharides, amino acids, peptides and other nutrients. It can directly supplement nutrients for crops, plant itself needs substances, participate in metabolic cycle, enhance crop growth potential, and enhance its disease resistance and stress resistance.

(3) half a month before sprouting: Kuifuling + organosilicon was used to clear the garden and spray the whole garden. For weak trees, diseased trees, trees with many fruits last year, and etiolated trees, the roots were irrigated with Qingkuanlick + Tilwang + Wofengsu. One is to kill the overwintering pathogens, and the other is to supplement nutrition for crops.

(4) Young fruit stage: Liangguoan + Wofengsu spray (once every 7-10 days, 2-3 times continuously)

Spraying the stem base along the stem after spraying the leaves can effectively prevent the occurrence of stem base rot and promote the root growth after the liquid flows into the soil and is absorbed by the root system.

(5) after fruit harvest: Kuifuling + Wofengsu + Dilwang (trial) spray, at the same time with Qingku Like + Tilwang + Wofengsu irrigating roots. After fruit picking, a large number of wounds will be caused and tree sap will flow out from the stalk, all of which are nutrients, and the pathogens will take advantage of the opportunity to multiply and invade from the wound. The first is to kill the source of bacteria; the second is to repair the wound and block the invasion of pathogenic bacteria to reduce the incidence of disease; the third is to provide plants with polysaccharides, peptides, amino acids and other nutrients to rejuvenate trees and enhance stress resistance.

(6) the diseased plants were smeared with Kuifuling solution on the stem base, or the affected parts were sprayed with high concentration combined with Qingku Rick + Wofengsu + Dilwang root irrigation and Liangguoan + Wofengsu spray.