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The pathogen of soybean rust has developed resistance to a single-acting fungicide in South America

Soybean is one of the most important crops in South America. In Brazil, soybean plays an important role in the economic development. The export of soybean and its processed products is a main source of income of foreign currency in Brazil. The income of many farmers is dependent on the growth of soybean and the yield of soybean. The recent Sino-US trade friction has facilitated a rapid increase in Brazil’s export of soybean to China. In 2017, some 50.93 million tons of soybean imported to China was supplied from Brazil, which accounted for 53.3% of China’s total imports. Compared to soybean in other countries, the soybean of South America is cost effective, with high protein content, while the price appears to be competitive. The favorable situation in exports will stimulate the plantation of more soybean by the farmers of South America. The soybean output of South America this year is expected to hit the second highest record in history, according to the climate condition and satellite remote sensing.

The Asian soybean rust has been for long a major disease causing damage to soybean in South America. Since the first-time occurrence of Asian soybean rust in Brazil in 2000-2001, its impact on the soybean crop has lasted for nearly 20 years. The Asian soybean rust tends to occur in warm and humid environments, which may damage the crop leaf and kill crops, resulting in a serious loss of yield.

Over the last dozen years, Asian soybean rust has been spreading overall. Farmers have increased the use of fungicides, which has brought about a serious concern over the increasing resistance issue. The increasing resistance may result in a situation where almost no pesticide can be used for the control of diseases. Statistics show that the sale of fungicides in Brazil has tripled that of 10 years ago, while nearly 56% of the fungicide is consumed for application on soybeans. Experts are calling for action by South America to import more new product varieties for the control of diseases, and are considering a soybean rotation practice.

After a long-term selection, the pathogen of soybean rust has developed resistance to a single-acting fungicide.
Since 2008, soybean growers are facing an erosion in the efficacy of Demethylation Inhibitors, also called Sterol Biosynthesis Inhibitors. After that, the Quinone Outside Inhibitors in 2014 and the last confirmation by Fungicide Resistance Action Committee (FRAC) was published in 2017 for the Succinate Dehydrogenase Inhibitor.

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Keywords:Organic Silicone Agricultural Additive, Polyether Modified Trisiloxane, Organic Silicone Surface Agent, Wetter, Spray Regulator, Pests, Rice, Rice Weevil,
Aggregate Sheath Spot Of Rice, Piricularia Leaf Spot Of Rice, Brown Spot, Bipolaris Oryzae, Panicle Mite, Cockspur Grass, Cyperus Difformis, Forb Steppe,
Banded Sclerotial Blight, Tea, Tea Mosquito Bug, Helopeltis Antonii, Empoasca Flavescens, Tea Green Leafhopper, Tea Tortrix-Caterpillar,
Homona Coffearia, Tea Flush Worm, Cydia Leucostoma, Scarlet Tea Mite, Brevipalpus Phoenicis, Soybean, Phytophthora, Rhizoctonia,
Soybean Aphids, Fusarium Wilt, Wheat, Wheat Aphids, Armyworms On Wheat, Greenbugs, Cereal Leaf Beetle,
Wheat Stripe And Stem Rust, Corn, Root-Knot Nematode, Gray Leaf Spot, Northern Corn Leaf Blight,
Sweet Corn Rust, Aspergillus Flavus, Aspergillus Ear Rot