This issue of the Plant Protection Lecture Hall has brought about the causes and prevention methods of diseases such as ginger, kiwi, corn, camellia tree and grapes.

Question: The ginger in the ground is wrinkled and can't be opened. There is a dead heart. There is a yellowish edge on the edge of the ginger leaf. There is no root rot in the root. Is it caused by high temperature? How to cure it?

Experts answer: The root system is not caused by many reasons, the physiological disease is bad, the door eye, the new leaves are not showing, and the film is opened to see if there is any damage caused by the thrips, and the heartworm is harmful. The soil in the field is too dry. It is recommended to pour water once every 10 days. The specific solution: First, combined with watering and applying Ada combination or copper rosinate + 39% cumin a combination of bactericidal and soil-borne diseases, and with the addition of the double humic acid water soluble fertilizer 1 generation, rushed three times The second is to combine the cockroach and the heartworm (such as chlorantraniliprole, carbaryl salt, acesulfame + enepyrazin) with wood vinegar foliar fertilizer to promote rooting and strong seedlings. Wood vinegar foliar fertilizer once every 7 days, even three times. Also pay attention to shading, big ginger is cool, not heat resistant.

Q: Is the grape kernel soft?

Experts answer: The softness of the grapes leads to a decrease in flesh and a soft skin, which is caused by many reasons. First, root water, low soil temperature, root absorption of calcium, potassium and zinc are difficult, organic matter is difficult to transport to the fruit, and the pericarp cells are also blocked and caused to be soft; second, the soil itself lacks these nutrients, and the soil element is too high, resulting in Potassium and calcium antagonism; Third, low temperature and illuminate, photosynthesis and respiration are blocked, organic matter accumulation is insufficient; Fourth, the disease directly causes disease. The solution is to comprehensively prevent and cure, remove accumulated water, dead branches and leaves, pruning branches and leaves, and receive light reasonably. The roots are supplemented with humic acid + alginic acid + nutrient element fertilizer based on phosphorus and potassium.

Q: How to treat kiwi yellowing?

Experts answer: Huanghua should consider and treat from many aspects. Such as: 1. Due to lack of yellowing: the leaves are good for vein yellowing to supplement magnesium and copper, and the leaves are yellowed to supplement iron (preferably sprayed with iron); 2. Soil-borne diseases, root rot Yellowing caused by the same: first roots, with thiophanate and humic acid for root irrigation, then spray some chelated iron plus brassinoin; 3. underground pests eat yellow rhizome caused by roots: kill antiprotozoal agent with wound healing promoting root nutrients, such as fulvic acid IRRIGATING foliar spray fertilizer chelated iron plus alginic acid; 4 overload caused yellowing: first rule "heart"; 5 sealed yellowing necessary. Doing summer shears work.

Q: What disease is the Camellia tree? How to prevent it?

Experts replied: This is a serious phenomenon in which the roots of newly planted Camellia oleifera are seriously damaged, and the absorption capacity is weakened. It is normal for some trees with severe root damage to die first. The dryness of new long leaves is caused by deficiency and insects. It is recommended that the clear ditch in the low-lying area of ​​the garden should be drained, and the bio-organic fertilizer should be applied to the garden. When transplanting, the root system can be used with the rooting agent to promote the root system. The roots survive, and the leaf surface is sprayed appropriately. The medium and trace element foliar fertilizer + nail support + avid high chlorine / imidacloprid, timely supplement the leaf nutrition, prevent disease and insects, promote survival and growth.

Q: What medicine can be controlled by corn shrinkage?

Experts answer: Corn rough disease must be based on prevention, it is difficult to treat after the occurrence. First of all, it is necessary to prevent and control the poisonous insects such as the gray planthopper and the thrips, and control the source of infection. The best solution: 1. Prevent seed dressing from planting: select seed dressings such as thiamethoxam, imidacloprid and fipronil. Secondary coating and seed dressing, pest control and disease prevention; 2. In the 3-5 leaf stage, timely spraying: flupentate + insecticide, combined with viral inhibitors (lentin, phytopathogenic, amino oligosaccharides, etc.) ) + nutrients (alginic acid, chitosan, brassinolide, etc.), insecticide and disease prevention, killing in the germination stage; 3. staggering the peak of the planthopper, according to each region, planting can be delayed 3-5 Around day.

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