Ginger growers sometimes find that ginger has yellow leaves, so what is the reason? What preventive measures are there? Next, Bian Xiao will tell you about it!
Causes and control measures of yellow leaves of ginger
1, ginger explosion
It mainly infringes on ginger roots, underground stems and aboveground stems.
At first, the infected ginger was flooded and yellow-brown, and the inside gradually softened and rotted, squeezing out dirty white juice, which smelled bad.
The stem is diseased, dark purple, the internal tissue turns brown and rotten, the leaves wither, the leaves are yellowish, the edges curl, and finally die.
Sick ginger seeds are the main source of infection, and improper use of water and fertilizer, high temperature and humidity, sunny and rainy days and drastic changes in ground temperature are also the main causes of ginger blast.
Pathogens can also spread through running water and underground pests.
Preventive and control measures:
(1) Agricultural prevention and control: select plots with high terrain and good drainage for planting; The base fertilizer is mainly decomposed organic fertilizer; Pull out the diseased ginger in time after finding it, take it out of the field and bury it deeply; After the emergence of diseased plants, flood irrigation and serial irrigation should be stopped, and sprinkler irrigation and shallow ditch irrigation are suitable.
(2) Chemical control
(1) The diseased plant and the 3-4 meters around the diseased plant are surrounded by soil and sprinkled with quicklime.
Garlic oil 1000 times+Ralstonia solanacearum 90- 150 times+Trichoderma harzianum 300 times, root irrigation, flood irrigation.
In order to consolidate, you can pour it again in the above way within 2-3 days.
Wherein garlic oil 1000 times+chlorothalonil 90- 150 times is sprayed for 2-3 times.
(2) take the dead trees and soil together, and use thin film bags instead of woven bags to avoid spreading germs everywhere.
Fill the soil with quicklime, enclose it with soil and sprinkle with quicklime.
2. Leaf blight
Ginger leaf blight mainly harms leaves, which is yellow-brown at first, and then gradually spreads to the surface of the whole leaf, with small black spots on the affected area, and when it is serious, the whole leaf turns brown and withered.
It is easy to get sick under the conditions of high temperature and humidity, continuous cropping, too dense plants, poor ventilation, excessive nitrogen fertilizer and too fast plant growth.
Preventive and control measures:
(1) Agricultural prevention and control: The sick and disabled bodies should be thoroughly removed in autumn and winter, and the diseased leaves should be removed in time after the disease occurs in the field, buried or burned.
(2) Chemical control: 90- 150 times chloropicrin+1000 times garlic oil was sprayed on the leaves for 3 times, with an interval of 2-3 days, and the third time was sprayed with 600 times warfarin.
In severe cases, corresponding chemicals can be synthesized.
3. Sheath Blight
Also known as damping-off disease, it mainly harms leaf sheaths and leaves.
Gray-green round lesion appeared on the diseased leaf sheath, and then expanded into irregular or rectangular shape, and the leaves were submerged by the lesion. After expansion, they are large and irregular lesions with moire patterns, which soften and rot. When the humidity is high, white spider silk hyphae are produced at the diseased spot, and the hyphae gather in the later stage to form sclerotia.
High temperature and high humidity, dark planting land, poor ventilation and light transmission, partial application of nitrogen fertilizer, heavy soil viscosity, continuous cropping and insufficient fertility are all easy to get this disease.
Preventive and control measures:
(1) Agricultural prevention and control: timely ditch cleaning and drainage to reduce field humidity; Avoid using rice stalks as mulch for ginger fields; Paddy-upland rotation; Apply decomposed organic fertilizer.
(2) Chemical control: The method is the same as bacterial blight.
4. Anthrax
It mainly harms leaves, and leaf spot disease mostly starts at the edge of leaf tip, which is brown spots soaked in water at first, and then expands into spindle-shaped, oval or amorphous spots, with obvious or inconspicuous moire on the surface and yellow discoloration on the edge of spots.
In the late stage of the disease, the diseased spots combine into patches, and the leaves turn brown and wither.
When the air is humid, small black spots will appear on the surface of the spots.
Continuous cropping, high humidity in the field, partial application of nitrogen fertilizer, excessive growth potential, rainy more prone to disease.
Preventive and control measures:
(1) agricultural control: select plots with deep soil layer, rich organic matter, dry terrain and good drainage, and cultivate them in high ridges and deep ditches; Apply enough nitrogen fertilizer and increase the application of phosphorus fertilizer, potassium fertilizer and organic fertilizer; Remove the diseased plant residues in time.
(2) Chemical control: The method is the same as bacterial blight.
Well, that's all I want to share with you today. If a friend who grows ginger finds yellow leaves, he'd better find a suitable reason to do something! I hope this article is helpful to everyone!
So much about the causes and preventive measures of ginger yellow leaf disease. Welcome to read other agricultural contents in Qinggua.com. ..
Recommended reading: How many times does it take to cultivate ginger? What problems should we pay attention to when cultivating soil?