How to control bean blight

Beans, also known as cowpeas, are rich in vegetables in summer. Any of various cultivated species of the genus cowpea that form long pods and are annual twining herbs. Alias beans, longhorn beans, belt beans, undress beans. Contains a variety of vitamins and minerals. The regeneration ability of bean root system is weak, and direct seeding is often used. The optimum temperature for germination is 25-30 ℃, and the air temperature should be above 20 ℃ when sowing.

Morphological characteristics of beans

Annual, herbaceous vines or suberect herbs, sometimes apically twining. Stem subglabrous. Pinnately compound leaves 3-foliolate; stipules lanceolate, ca. 1 cm, inserted into a short distance, linear; leaflets ovate-rhombic, 5-15 cm long, 4-6 cm wide, apex acute, margin entire or subentire, sometimes lavender, glabrous. Racemes axillary, long pedicellate; flowers 2-6 clustered at the tip of inflorescence, often with fleshy dense glands between pedicels; calyx light green, campanulate, 6-10 mm long, lobed teeth lanceolate; Corolla yellow-white and slightly purplish, ca. 2 cm long, each petal petiolate, upper petal oblate, ca. 2 cm wide, apex retuse, base slightly auriculate, wing slightly triangular, keel slightly curved; ovary linear, hairy. Pods pendulous, erect or obliquely spreading, linear, 7.5-70 (90) cm long and 6-10 mm wide, slightly fleshy and swollen or solid, with many seeds; seeds long elliptic or Terete or slightly reniform, 6-12 mm long, yellowish white, dark red or other colors. The florescence is from May to August.

How to prevent and cure bean blight?

Symptoms of bean blight

The main damage to stems, leaves and pods, mostly occurred in or near the stem nodes, especially near the ground. The disease part was water-stained at the beginning, then the wet rot constricted around the stem, and the leaf vines above the disease part withered and died. When the humidity is high, the cortex decays and the surface produces white mold. The leaves showed dark green water stains at the beginning of the disease, and then enlarged into round light brown spots with white mildew on the surface. The disease department of the pod is also mildew and rotten.

Control measures of Bean Blight

1) select disease-resistant varieties.

2) implement crop rotation. Select sandy loam with good drainage, adopt high border and deep ditch, reasonably close planting, make it ventilated and transparent, and pay attention to timely drainage after rain.

3) Pesticide control. Timely spray protection in the early stage of the disease. 58% Redomir manganese zinc soluble powder 500 murine 800 times liquid, 64% antiseptic alum wettable powder 500 times liquid, 72.2% Pulic water agent 800 times liquid, can be sprayed once every 7 times every 10 days, 2 times 3 times in a row, the effect is better.