Zhang macular sunflower leaf surface-Iota

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Service > Zhang macular sunflower leaf surface

Zhang macular sunflower leaf surface

Sunflower leaf spot
Seedling, adult stage may be the disease. Cotyledons and seedling disease born nearly circular brown spots on the leaves, the external raw yellow halo, white spots on the back. Adult infected lesion measured more prostitutes provide sea Wei Yao magic super surprised angular glass, brown, or yellow halo, give birth to tiny black spots on the late, that germs pycnidia. Damp, shedding lesion or perforation, the incidence of re-integration of the lesion, the whole dead leaves. Brown lesions on stems and petioles infected narrow strips. Is important widespread diseases in the world. The disease infection by pathogenic bacteria sunflower leaf spot. Bacteria to hyphae and spores overwinter in plant debris, under a lot of shed spores in July, by the wind, rain spread. Lianyin rainy night dew large, low-lying, high density, such as the onset of especially heavy cropping land.

Control methods:

1. reasonable rotation: the introduction of more than three years of crop rotation and cereal crops.

2. To strengthen the cultivation and management: suitable for early sowing, close planting, timely weeding, increased fertilizer to improve plant resistance to disease. When the field water to be discharged in time. Bottom leaves early onset, the implementation of manual removal, deep focus and then reduce infectious pathogen.

3. Chemical control: prevention Sunflower agent effective for this disease, the same dosage. For a pesticide to rid of two diseases can faceplate and the lower leaves while spraying, prevention 1-2 times. When spraying, add canola within prime esters of plant growth regulators, can promote the growth of diseased plants recover as quickly as possible, plus 0.01% per hectare prime Tianfeng 150 ml or 0.1% Shuofeng 481 soluble powder 60 grams or 0.003 percent by love US 75 ml, improve the control effect. Spray volume per hectare while adding silicone additive effect Jie Li or thorough 75 ml, can improve the control effect save dosage.

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