How to control perilla rust

Perilla is an annual erect herb. Stem 0.3-2 m tall, green or purple, obtusely quadrangular, 4-grooved, densely villous. Leaves broadly ovate or orbicular, 7-13 cm long and 4.5-10 cm wide, apex mucronate or protruding, base rounded or broadly cuneate, margin coarsely serrate above base, membranous or herbaceous, green or purple on both sides, or purple only below, sparsely pilose above, pilose below, lateral veins 7-8 pairs, slightly closer to lower part, obliquely ascending, protruding from midrib above, slightly lighter in color Petiole 3-5 cm long, dorsally flattened, densely villous.

Growth characteristics of Perilla frutescens

Perilla has strong adaptability, lax soil requirements, good drainage, sandy soil, loam, clay loam, front and back house, ditch edge, fertile soil cultivation, good growth. Vegetables are the best crop in the previous crop. Fruit trees can be planted under young forests.

Temperature requirements of Perilla frutescens

Requirements for environmental conditions Perilla prefers a warm and humid climate. The seeds can germinate when the ground temperature is above 5 ℃, and the suitable germination temperature is 18-23 ℃. It can endure low temperature of 1-2 ℃ at seedling stage. The plant grows slowly at lower temperature. It grows vigorously in summer. The suitable temperature during flowering is 22-28 ℃, and the relative humidity is 75% Mel 80%. More resistant to moisture, strong resistance to waterlogging, not resistant to drought, especially in the product organ formation period, such as too dry air, thick and hard stems and leaves, more fiber, poor quality. It has a wide adaptability to soil and can grow in shady places.

How to prevent and cure perilla rust?

Symptoms of perilla rust:

On the back of the leaf, there are scattered yellow nearly round naked vesicles, that is, the summer spore pile of the pathogen. When the disease spot occurs seriously, there are a large number of disease spots covering the back of the leaf, but the leaf is not withered. Sometimes it can be seen that the summer spore pile on the back of the leaf is almost white and the tether is only Ramula-riacoleosporiSacc. It is said that it is caused by hyperparasitic bacteria.

The pathogen of perilla rust: Coleosporium,perillaeSyd. It is called perilla sheath rust, which belongs to basidiomycetes subphylum fungi. Summer spores are yellow-orange on the back of leaves, scattered to concentrated, round or oval, 0.2-0.5mm in size, not powdery; summer spores are light yellow, spherical to subglobular, dense and sunken on the surface, the wall is colorless, about 1.5 μ m in thickness, and the size is 1726 × 12mol / 18 (μ m). The teliospore stage was not seen.

The transmission route and pathogenic conditions of perilla rust: the pathogen overwintered as winter spores on the remains of the disease, and summer spores could be produced all the year round in the warm south, and spread throughout the year, sometimes without winter spores. The disease is easy to be induced by high temperature and high humidity.

Prevention and control of perilla rust:

The main results are as follows: 1) Clean the countryside, strengthen the management, adopt the technology of formula fertilization and close planting properly.

2) at the initial stage of the disease, spraying 15% trielidone wettable powder 1000ml 1500 times or 50% triadimefon EC 800x, 50% sulfur suspension 300x, 25% phthalic demulsifiable EC 3000 times, 25% dichloromethone 4000 times plus 15% trielidone wettable powder 2000 times, 70% mancozeb wettable powder 1000 times plus 15% trielidone wettable powder 2000 times, 30% solid stone sulfur mixture 2000 times, 12.5% Supra wettable powder 4000Mel 5000 times tuck Once every 15 days or so, prevent and cure once or twice.