Occurrence and control of brown spot and powdery mildew of Flos Lonicerae

Honeysuckle, also known as Erhua, honeysuckle, is a shrub for many years. The dried flower seedling of Flos Lonicerae is a widely used antibacterial medicine raw material, which has the effect of clearing heat and detoxification, activating meridians, reducing inflammation and detumescence. With the development and utilization of the medicinal value of honeysuckle, honeysuckle is planted more and more widely. However, the harm of Flos Lonicerae brown spot and powdery mildew also showed an increasing trend year by year. The occurrence and placement of these two diseases are described as follows:

Brown spot of Flos Lonicerae

Flos Lonicerae brown spot is a leaf disease caused by subphyllococcosis, which is common and harmful, which often causes plant growth weakness and serious plant death.

one。 Occurrence regularity

The pathogen overwintered on the diseased leaves and mostly occurred in the middle and later stages of plant growth, and the disease was at its peak from August to September. This pathogen likes high humidity and is more serious in rainy years and in humid environment.

two。 Symptoms and diagnosis

The leaf is the site of the disease. Brown spots were formed on the leaves at the initial stage of the disease. with the development of the disease, the brown spots gradually expanded into brown round or irregular spots. There is a gray-black mildew on the back of the lesion. When the disease is serious, the leaves fall off.

three。 Prevention and cure method

1. Agricultural prevention and control should strengthen field management, and intertillage should be carried out once in spring and autumn every year. Nitrogen fertilizer and phosphorus fertilizer were applied once in spring, late May and early July, and soil fertilizer was applied once in autumn to balance soil nutrients, promote plant healthy growth and enhance disease resistance, and thoroughly cut off diseased branches and clear deciduous leaves in autumn. burn it out of the field.

two。 The chemical control agents used are 50% carbendazim 800 × 1000 times, 50% topiramate 1000 times, or 1% Bordeaux spray 1 / 200, once in the rainy season, and then twice every 10 days.

Honeysuckle powdery mildew

Honeysuckle powdery mildew is a disease caused by powdery mildew of ascomycetes. Leaves, flowers and fruits can all suffer from the disease, which is common and harmful, which often causes branches to dry up and plants die seriously.

one。 Occurrence regularity

The pathogen spent the winter on the remnant of the diseased plant with ascomycetes. In the second year, the ascospores were released and the plants were infected. After the disease of the plant, the diseased part produces conidia and carries on the infection. The growth of the plant is too dense and the disease is serious.

two。 Symptoms and diagnosis

Powdery mildew mainly damages the leaves, flowers and fruits of honeysuckle. In the early stage of the disease, white spots appeared on the leaves, and gradually expanded into white powder spots in the later stage. When the disease continued to develop, the disease spots continued to spread all over the leaves, causing the leaves to yellowing, wrinkling and deformation, until the leaves fell. The symptoms are similar in flowers and fruits. When the disease is serious, it can cause falling flowers, fallen leaves, dry branches, and even plant death.

three。 Prevention and cure method

1. Disease-resistant varieties are selected for agricultural control, reasonable close planting, shaping and pruning, ventilation and light transmission, so as not to make the plant too shady; be careful not to apply too much nitrogen when fertilizing, so as to avoid dense plant growth and serious disease.

two。 Chemical control uses 50% carbendazim wettable powder 1500 times liquid spray, 50% colloidal sulfur 100g, plus 90% trichlorfon 100g or 50% dimethoate EC 15g, water 20kg, can also control anthracnose. Spray once every 7-10 days for a total of 2-3 times.