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The war between mankind and nature, regardless of victory or defeat, will surely injure humanity. Then, when people once again faced the rice crop withered in the field, besides being startled and hurt, did they still think of something else?
Over-reliance on imidacloprid is the culprit The severity of this pest is rare in the last decade or so. In Zhejiang, 70% of the 14 million acres of late rice in the province were attacked by rice planthoppers. In severe areas, there were more than 1 million insects per acre, and even 10 million.
Wang Huadi, a researcher at Zhejiang Plant Protection Station, said that rice planthoppers are a common pest and can generally be solved by spraying pesticides at an early stage (usually from the second to third generation of insects). Imidacloprid is the biggest nemesis of rice planthopper, with significant efficacy and low price. It has been widely used for more than ten years. It is believed that rice planthoppers will not pose a threat as long as imidacloprid is in hand. But this year, rice fly locust infestation unexpectedly occurred.
He said that the typhoons that frequented this summer not only brought a large number of rice planthoppers directly from Southeast Asia, but also brought about rapid changes in heavy rainfall and warm and cold temperatures. This was an outbreak of the late fourth-generation fifth generation rice planthoppers. Sexual growth creates suitable climatic conditions. However, people's over-reliance on imidacloprid makes the best time to prevent rice planthoppers from being missed. Rice planthoppers have produced extremely high resistance to imidacloprid. Farmers would not have imagined that the pesticide testing department could not foresee it in time. Until September of this year, after a large area of ​​insect pests occurred, all areas had reported the failure of imidacloprid. Experts at the Nanjing Agricultural University organized an inspection to confirm that rice planthoppers have developed resistance to imidacloprid, and that most regions show “high resistance†and “high resistanceâ€. ". The agricultural department quickly stopped using it, but it was a bit late.
The lack of medication guidance is worrying. An old farmer in Jiaxing sighed and said that like this year, the pests were treated vigorously, and there were memories only in the 1970s. The plant protection cadres in the provinces, counties, and towns all came and taught medicines with hands. But if you can come early or come often. At that time in the 70's, there was a production team commander sitting in front of the array. The plant protection staff below was turning around in the fields all day. Now it's not the same. The crop has a worm and it's a disease. The peasants can only guess it themselves. The pesticides are a lot. The boss recommends this for a while and recommends it. He can hear it in a very confusing manner and use it sparsely.
The staff of the Plant Protection Station also complained: In the past, there was a strict organization system in the countryside, and the production team leader gave an order and all the team members assembled. Now, farmers are scattered and their mobility is so great that they will not be able to organize for half a year. It is not realistic for the plant protection personnel to run one by one.
If the government's plant protection personnel are not counting on, who will the farmers face when they encounter difficulties? Dealers and pesticide companies do not seem to have this obligation.
It is understood that due to the absence of guidance from the government's functional departments, the issue of drug safety in agricultural products in China is already very prominent. In order to deal with the blind use of pyrethroid pesticides by rice planthoppers, some farmers have not only killed the natural enemies of rice planthoppers, but also stimulated the growth of rice planthopper populations. At the same time, some companies are aiming at the time when pesticides are out of stock, and injecting mixed-formulation products that have no practical effect on mixed fishes, causing greater losses to affected farmers.
An expert in the field of pesticides revealed his concerns: The chaos in the pesticide market is no longer a day. Scientific drug use is difficult to put in place in actual production. These have seriously threatened China's food security.
Taking pharmacokinetic drugs is not a long-term solution Since rice planthoppers are an ever-present pest, and imidacloprid has already produced high resistance, is there a new drug on the market that can replace it as an indication drug? This means that this new drug will have a big market.
However, Zhang Huaqiang, chief adviser of the WTO/TBT-SPS Notification and Consultation Center in Zhejiang Province, said: “I am opposed to the suggestion that when a pesticide fails, it immediately recommends another pesticide to replace it. The pesticide used in our country is not too little, but Too much, we overemphasized the positive effects of chemical pesticides, but did not pay enough attention to its side effects.The insects in the world are said to have 100,000 species, and less than 3,000 species actually cause losses to crops. The spearhead pointed at 100,000 species, causing ecological imbalances and contaminating food and the environment. In recent years, excessive pesticides have become major trade barriers in Europe and the United States and other countries that restrict the export of agricultural products in China. We must face this issue squarely."
And if there is no pesticide, is there a better way?
"Pesticide use is only a link, but not all, of pest control. We should give full play to natural control factors and coordinate agricultural control, biological control, physical control methods and chemical control, and comprehensive management." Although the current outbreak of rice planthoppers Under the circumstances, pest control must rely on another effective pesticide, but Zhang Huaqiang believes: "This is only an expedient measure."
Obstetrics and gynecology perspective: Rice planthoppers are used to cause fatal injuries from exposure to pesticides
With the advent of the harvest season, large-scale battles between humans and rice planthoppers competing for food in the provinces of the Yangtze River Valley have gradually begun. The weather is getting colder and the remnants of the rice plant fly will return to the warm southern winter. Now we cannot count how the war initiated by the rice planthoppers will have an impact on food production. However, a considerable degree of reduction in production is certain.