Diseases and Insect Pests of Hybrid Dianthus

Major pests and their control

1. Brown spot

Symptoms: The main damage leaves, pedicels, stems. The early stages of leaf infection are round spots with brown rings on the edges, slightly convex and gradually expanding outwards. Sometimes the lesions are fused together into pieces, causing the leaves to dry, while the stem spots develop long strips, and the pedicels cause flowers. Yellow withering. Sometimes the lesion appears black mold layer.

Prevention:

(1) Control the humidity of the medium and the air, do not increase the ventilation and light transmission. It can be used to prevent 2000 times of carbendazim solution when planting;

(2) At the beginning of the disease, 50% benomyl 1500-2000 times of the whole plant was sprayed.

2. Disease

Symptoms: The disease can be found in both seedlings and plants. The main stem and branch diseased parts first saw water stains, and then gradually deepened. The damaged tissues of the plants were transported and the plants withered, sometimes appearing lodging.

Prevention:

(1) Control the humidity of the cultivation environment, ventilation and light transmission, and try to cultivate by facilities. The open season cultivation should avoid the rainy season, or avoid the potted medium splashing to stems and leaves due to rain.

(2) The cultivation medium should be thoroughly disinfected before use.

(3) After transplanting, it can be watered with 1500-fold of thiophanate-methyl or 2000-fold of Detroit, once every 10 days.

(4) In the early stage of disease, the following medicines can be used to prevent and cure 69% Anke manganese zinc 1500 times solution, 58% thiazolycin Mn-Zn solution 1000 times, 64% antivirus 1500 times solution, and 50% chlorothalonil smoke agent. The amount of 1000 grams / mu.

3. Bacterial spot (bacterial disease)

Symptoms: Occur in leaves, flowers and stems. The lesions are gray-brown in the middle and are long strips with brown lines around them. Sometimes when the humidity is high, the lesion appears white liquid. Frequently, the lesions merge into one piece, resulting in the death of yellow leaves. Stems also dry up and die.

Prevention:

(1) Reduce the humidity, do not over-water, reduce plant, leaf water.

(2) To enhance plant resistance and cultivate strong seedlings, excessive application of nitrogen fertilizer should not be used to weaken the disease resistance of plants.

(3) In the early stage of the disease, the whole plant was sprayed with streptomycin sulfate 2000-2500 times.

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