**Core Tip:** Wheat larvae have become a major pest characterized by sudden outbreaks, frequent occurrences, and widespread epidemics. It is a global pest found in major wheat-growing countries across Asia, Europe, and the Americas. In China, wheat larvae are also prevalent in key wheat-producing regions. There are two main types of wheat larvae: red and yellow. Red larvae are typically found along riverbanks in plains, while yellow larvae are more common in plateau and mountainous areas. Although last year’s harsh cold weather had some impact on the environment, it had minimal effect on the survival of the larvae.
**First, the Characteristics of Occurrence**
Wheat larvae have developed a close symbiotic relationship with wheat over time. Their life cycle—growth, development, emergence, egg-laying, and hatching—is synchronized with the growth stages of wheat. For example, larvae emerge during the booting stage of wheat, and eggs hatch during the early grain-filling phase. As long as wheat survives, the larvae can thrive. This means the infestation area is extensive, covering most winter wheat production zones in the country. If not properly controlled, it can lead to significant yield losses or even total crop failure, making it a serious concern.
The characteristics of its damage include:
1. **Small size:** Up to 30 larvae can be found in a single wheat kernel.
2. **High concealment:** Only for about a week each year are they visible on the soil surface; otherwise, they remain hidden in the soil or inside the grains, making detection difficult.
3. **Destructive potential:** If three larvae enter a single grain, they can completely drain the kernel's contents. One larva can suck out one-third of the grain's moisture.
4. **Long survival:** Larvae can survive in the soil for 6 to 12 years, making them hard to eradicate and allowing their population to persist.
5. **Short control window:** The critical periods for prevention are just one week during the flooding season and three days during the adult stage. Missing these windows can result in severe yield loss.
**Second, Implement Effective and Timely Prevention**
Given these characteristics, local authorities should act early, avoid complacency, and focus on the "double attention" strategy—prevention and control during both the flooding season and the adult stage. Key measures include:
1. **Soil Treatment During the Sucking Period**
When larvae are visible on the soil surface, it is the best time to apply control measures. Due to weak seedlings this year, the growth cycle has been delayed, so all regions should collaborate with media to provide accurate forecasts and educate farmers on effective timing for control.
Currently, there is a lack of suitable pesticides, and many farmers struggle with choices, leading to misuse of chemicals. Based on recent experience, using 1.5 kg of 2.5% methyl isothion granules (produced by Hubei Tianmen Yipula Agrochemical Company) or 5% chlorpyrifos granules (from Shandong Huayang Pesticide Company), at 600–900 grams, mixed with 25–30 kg of sand, and evenly spread over the fields, can effectively manage the infestation. These granules should be prepared according to manufacturer instructions. When applying the poisoned soil, avoid using dew water and prevent contact with wheat leaves to avoid phytotoxicity. After application, sweep the soil with a broom to ensure maximum effectiveness. High-toxicity pesticides should be avoided, and unified organization, command, and supply of materials are essential. Farmers should coordinate their efforts to ensure timely and effective control.
2. **Control During the Adult Stage**
From late April to early May, adults begin emerging from the wheat heads and fly to the ears to lay eggs. Spraying during this period is crucial. Solutions such as 5% beta-cypermethrin diluted 1500 times, 40% dimethoate diluted 1000 times, or combinations like imidacloprid + dichlorvos + beta-cypermethrin, or imidacloprid with dichlorvos and beta-cypermethrin, can be used. Spraying should be thorough to reduce adult populations and egg-laying, which is vital not only for controlling current damage but also for preventing future outbreaks.
In conclusion, timely and coordinated action is essential to manage wheat larvae effectively and protect wheat yields.
Grinding Stone
Industrial applications editor broadcast
Whetstone sintered corundum (ruby) : A kind of microcrystalline corundum product sintered at high temperature. It has a compact and delicate structure and high hardness and strength.
The products are rosy red. The products are small grinding wheel type whetstone, standard type whetstone and grinding head type whetstone. When grinding the workpiece, it can maintain sharp edge and stable geometry for a long time.
It is suitable for forming and grinding of instrument industry, precision parts, micro cutting tools, tools and precision abrasive tools, etc. The precision surface roughness of machining can reach about 0.05μm.
Product SPECIFICATIONS: flat sand wheel whetstone with diameter less than 100 for small grinding wheel type, whetstone with various geometric shapes less than 200*50*25 for standard type, whetstone with diameter less than 25 for grinding head type.
Grinding method
About diamond grinding paste, particle size from W40 to W0.5. W40 is the coarsest, with a large amount of grinding, and W0.5 is the smallest. It is used for polishing, and it does not anneal, and it can also grind the hard knife.
Method of use:
The coarse W40 abrasive paste applied to borotartar can accelerate and increase the grinding amount without annealing.
Then, AFTER the rough grinding paste on the knife is cleaned, W0.5 grinding paste is applied to the ruby or natural jade for polishing, and the effect thrown out is a mirror.
Green silicon carbide, white corundum, brown corundum of these three kinds of whetstone hardness is not enough, coupled with a little coarse particle size, easy to grind out the cross, and the other three kinds of whetstone in polishing, grinding will not annealing.
If the particle size is greater than 1000, there is no difference. It mainly depends on the grinding paste used. When the grinding paste of W1.5 is applied to the ruby with 1000 mesh, its grinding effect is the effect of the grinding paste of W1.5, that is, the effect of the whetstone with 2500 particle size
Grinding Stone,Diamond Grinding Pellets,Carborundum Oil Stone,Oilstone Sharpening Stone
Henan Jinlun Superhard Material Co., Ltd , https://www.jinlunsuperhard.com