Update: Plant Health News (07 May 14)

Hurricane Manuel devastated crops when it hit Mexico last year (NASA)

Here’s a taste of some of the latest stories about plant health, including a new device that can identify plant pests, the estimated economic loss from Mexican mangoes damaged by Hurricane Manuel and a new study into the optimal production of sweet potato.

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The Soybean Gene: Scientists Discover the Key to Nematode Resistant Soybeans

Scanning electron micrograph of a soybean cyst nematode and egg © Ethan Hein via Flickr (License CC-BY-NC-SA 2.0)

Soybean (Glycine max) is an important crop that provides a sustainable source of protein and oil worldwide in countries such as the USA, Brazil, Argentina, India and many African countries, including Nigeria, South Africa and Uganda. The soybean cyst nematode Heterodera glycines is a microscopic roundworm that feeds on the roots of soybean and is a major constraint to soybean production. This nematode causes more than US$1 billion in yield losses annually in the United States alone, making it the most economically important pathogen on soybean. For over 50 years the planting of resistant cultivars and crop rotation have been the main management strategy for this pathogen, and only a few resistant plant types are used due to undesirable traits in other resistant varieties of soybean.  Moreover, the increase in virulent populations of the nematode on most known resistant plant sources coupled with the very limited knowledge of soybean resistance mechanism makes the development of new approaches for control of soybean cyst nematode a necessity. Continue reading