Symptoms and Control of Cucumber Blight

Cucumber, (scientific name Cucumis sativus Linn, English name Cucumber), cucumber plant of Cucurbitaceae. Also known as cucumber and cucumber. The color of the fruit is oil green or emerald green, with soft spines on the surface. It is widely cultivated in all parts of China and is now widely cultivated in temperate and tropical regions. Cucumber likes warmth and is not resistant to cold, so it is one of the main greenhouse products. Cucumbers, called cucumbers, were brought back to the Central Plains by Zhang Qian in the Western Han Dynasty. After the period of Wuhu and Sixteen Kingdoms, Emperor Shiller of Zhao taboo the word "Hu", and Fan Tan of Xiangguo County, Han Chen, changed it to "cucumber".

Morphological characteristics of Cucumber

Annual trailing or climbing herbs; stems and branches elongated, furrowed, white hispid. Tendrils fine, undivided, white pilose. Petiole slightly scabrous, hispid, 10-16 (- 20) cm long; leaf blade broadly ovate-cordate, membranous, 7-20 cm long and wide, both surfaces very rough, hispid, 3-5 angles or lobes, lobes triangular, dentate, sometimes margin ciliate, apex acute or acuminate, base curved semicircular, 2-3 cm wide, 2-2.5 cm deep, sometimes base backward. Monoecious.

Male flowers: constant clusters in leaf axils; pedicels slender, 0.5-1.5 cm long, puberulent; calyx tube narrowly campanulate or subcylindric, 8-10 mm long, densely white villous, calyx lobes subulate, spreading, nearly as long as calyx tube; Corolla yellow-white, ca. 2 cm, Corolla lobes oblong-lanceolate, acute Stamens 3, filaments nearly absent, anthers 3-4 mm long, connective protruding, ca. 1 mm.

Female flowers: solitary or sparsely clustered; pedicels stout, pilose, 1-2 cm long; ovary fusiform, scabrid, with small spiny protuberances. Fruit oblong or cylindrical, 10-30 (- 50) cm long, yellowish green when ripe, rough surface, with prickly verrucous protuberances, extremely sparse and nearly smooth. Seeds small, narrowly ovate, white, without margin, subacute at both ends, ca. 5-10 mm. Flowering and fruiting in summer.

Symptoms and Control of Cucumber Blight

Symptoms of cucumber blight: the adult plant infected with the disease, mainly appeared dark green water stains at the base of the stem or tender stem nodes, then softened, constricted, the leaves wilted above the diseased part or the whole plant withered, and the vascular bundle did not change color. The leaves are infected with disease, resulting in round or irregular water-immersed spots. Measures for prevention and control of cucumber blight: high ridge cultivation to avoid flood irrigation; grafting to prevent disease; seedbed treatment: mix 8 grams of metalaxyl wettable powder with soil and sprinkle on the seedbed with 8 grams of metalaxyl wettable powder per square meter, and spray the ground with 750 times of metalaxyl wettable powder before planting.

At the initial stage of the disease, 72.2% Purek water agent 600 times 700 times liquid, or 50% nail cream copper wettable powder 600 times liquid, or 72% Kelou wettable powder 700 times liquid and so on can be sprayed.

In addition, the common diseases are quenching (seedling stage), leaf spot (target spot), root rot, sclerotinia, bacterial leaf blight, bacterial wilt, soft rot, bacterial round spot and so on.