Although the autumn army worm 0715 has taken root on the ground, the harm has been controlled, and the organic field will test the parasites of "Trichogramma".

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According to the statistics of the Council of Agriculture, since the occurrence of the first autumn military pest in Taiwan on June 8, as of July 14, with the exception of Chiayi City, Taiwan has reported a total of 206 cases, including 118 adult cases. At present, 81 pieces of destruction have been completed, 122 cases of drug prevention and control have been completed, and 3 cases have yet to be processed. The Council of Agriculture said that the autumn army insects have taken root in Taiwan and will be managed in an integrated manner, including other common corn pests such as corn borer and aphids.

Chen Junji, vice chairman of the Council of Agriculture, said that the autumn military pest control is still in the second stage (drug control). The peak period of receiving notifications is before June 18, and the number of daily notifications has dropped to a few after June 21, indicating that the control strategy is effective. It is expected to enter the third stage of independent management by farmers by the end of July, and the parasitic flakes of "Trichogramma" have been tested in organic fields. if confirmed to be effective, an overall control strategy will be added.

Photo courtesy of / Council of Agriculture

There were cases all over Taiwan except Chiayi City, and the case was reported sporadically after July 1.

Since the first case of autumn military pest was notified on June 8 in China, a response team was set up. In the first stage, the way of incineration and burial was adopted. On June 18, it was found that the autumn military insect had propagated to the second generation, so the strategy entered the second stage. From the second stage to the present, the notification method has been used. After farmers' notification, experts from agricultural reform farms in various counties and cities will go to the scene to confirm, but it is confirmed that autumn military insects have directly adopted the way of spraying. All spraying costs are borne by the government.

After entering the second stage, in addition to notification and spraying, the response team also began to deploy pheromone detection sites at 74 ports and 426 major producing areas, totaling 500 points. The main purpose of pheromone detection sites is to monitor the distribution of adults. 259 confirmed areas were also found to have additional settings. Another purpose of these 259 detection points is to monitor whether the case continues to spread after it is reported to be destroyed. if it continues to spread, it means that a hot spot has been formed, then the strategy must be adjusted.

Chen explained that as of June 8, an incentive notification bonus had been set up before June 21, during which the peak began on June 12, and from July 1, the case report showed a stable and sporadic state, showing that the second stage of prevention and control was effective, which also significantly reduced the proportion of autumn military insects growing to adults, and the continuous spraying process made hot spots not concentrated, even in the same county and city, the region was scattered.

So far, with the exception of Chiayi City, other counties and cities have received cases. according to the distribution of Miaoli, the distribution is scattered, which is good news, which means that it is not a point to spread outward, but corresponding to the fact that the number of confirmed cases has dropped to sporadic, indicating that farmers' prevention and control are in place.

It is announced that 11 kinds of chemicals have certain control effect, but the effect of UAV spraying is not good.

Chen explained that the 11 pesticides announced at present are all control materials published by foreign countries. in order to confirm the control effects of these materials used in Taiwan, experts from academic units have been commissioned to test diseases and insect pests in the field. So far, all of these eleven chemicals have a certain degree of control effect, and other pesticides will continue to be tested before entering the third stage, and they will be announced one after another. Chen called on that in order to prevent the autumn army insects from developing drug resistance, these 11 materials had better be used in turn, so that the autumn army insects will not develop drug resistance in a short period of time.

In addition, it has been suggested that spraying with drones can greatly increase the spraying efficiency and area. after actual observation, it is found that UAV spraying only reaches the surface of plants, but most of the autumn insects are hidden inside or in the lower part of plants, so the effect is not good. at present, UAV spraying still needs to obtain a license to be used, which can only be issued by the poison test center, and the training stage has not yet been completed. Therefore, it is not recommended to use drones to control autumn bugs.

Committee of Agriculture: you don't need to spray as soon as you see a bug, depending on the degree of damage.

Chen Junji said that in the future, the key work of prevention and control will focus on integrated pest management (IPM), with IPM giving priority to prevention, supplemented by treatment, combined with a variety of control methods, and from an economic point of view, so that farmers can invest in the lowest cost and achieve maximum control effectiveness. They do not need to be sprayed as soon as they are found, and the extent to which they are harmed by autumn pests in the field should be considered before spraying will have the greatest economic value. On this basis, spray standards are set for farmers. The benchmark for prevention and control is that the damage to seedlings, ears and fruits reaches 10%, or 20% before heading before spraying chemicals.

Chen suggested that at present, there is no guarantee that there will be autumn military insects in the next phase. Rotation can be used to keep the fields clean, insolate, and flood the fields after ploughing, so as to reduce the probability of pupae emergence adults remaining in the fields. The recent high temperature and rainy weather not only slows down the life cycle, but also reduces the chances of many emergence adults. In addition, physical control, manual egg removal, or biological materials such as thurium can also be used to improve crop safety through long-term field inspections.

Parasitic wasps of Trichogramma, the experimental natural enemy in organic field.

Chen explains that since the autumn army insects have taken root in Taiwan, they will also be managed with integrated management, together with other common corn pests such as corn borer and aphids, and integrated with existing control. For the control methods of organic farmers, the parasitic flakes of Trichogramma are the most effective in organic field trials at present. After confirming that the control is really effective, it will be added to the control strategy.

Trichogramma is a kind of parasitic wasp. At present, as one of the ways to control corn borer, the experimental field of National Taiwan University Farm will teach and use the students in the compulsory course of the department of agronomy. The bee slices with bee eggs will be fixed on the leaf back of the corn plant. On average, one parasitoid can effectively control corn borer within 50 meters in diameter, and it has not been included in the control method of autumn walking army insect at present.

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In this regard, Liu Junhe, director of Cixin Farm in Taoyuan, said that Trichogramma parasitic wasps have never been used, and small use may not be enough to cover the cost, usually to avoid the outbreak period of corn borer, so as to save the cost of prevention and control. Cai Dehuang, a farmer in the land production combination of Yunlin Shuixiao Lin Youshan, said that he had never heard of the use of parasitic bee slices and acquisition channels in the past, which was not familiar to him. Judging by cultivation experience, the purchase of parasitic wasp slices should be estimated on the basis of land area. Because the effectiveness of parasitic wasp slices is difficult to quantify, if they are cultivated in a small area, they are not as fast as organic materials (thuri) or physical control.

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