Ginger root knot nematode disease is commonly known as ginger smut and ginger. In recent years, the disease has occurred in Laiwu, Jixian, Anqiu and other places in Shandong. With the continuous cropping of ginger and large-scale planting, the disease has aggravated and spread the trend, and in some areas has risen to the second largest disease after ginger plague, which has a huge impact on the production of ginger. Make the ginger with a serious disease lose its edible value.
First, happen
Ginger can occur from the seedling stage to the adult stage. The diseased plants can produce tumor-like root knots of different sizes in the roots and rhizomes. The root knots are generally the size of the beans, sometimes connected in a string shape, initially yellow-white protrusions. Later, it gradually turns brown, and it is herpes-like rupture and rot. Due to the damage of the roots, the absorption function is affected, the growth is slow, the leaves are small, the leaves are dark green, the stems are short, and the branches are small. It can be seen from the middle of July, and can be about 50% shorter than the normal plants in the middle and late August. But the plants rarely die.
Second, prevention
1 Implement a rotation.
It is best to carry out a rotation of 2 to 3 years with grass crops, so that the condition can be significantly reduced.
2 Use no disease-causing ginger and deep-turn soil.
3 soil disinfection
It can be applied to soils 13 to 20 cm deep from the soil surface 2 to 3 weeks before planting, and the soil should be kept moist before application and compacted after application to achieve fumigation of nematodes. purpose.
4 chemical control
Application of nematicides at the time of planting or in the middle of July to the beginning of August, according to the condition of the ditch or hole application.
Nematicides include: contact-killing nematicides such as 10% Yishubao, systemic nematicides such as aldicarb, carbofuran, indole phosphorus, gram phosphorus and the like.
5 biological control
Strengthening cultivation management, removing concentrated treatment of sick and disabled bodies, and adopting measures such as rational fertilization and irrigation can alleviate diseases.
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