January 11, 2005
Asian soybean rust may affect dry beans
Concern about Asian soybean has spread to dry beans.
Erick DeWolf, Penn State plant pathologist, says that with soybean rust found as far north
as Tennessee producers of dry beans and other legumes in his and other eastern states have
to be concerned about the disease, too.
Asian soy rust can infect at least 100 known plant species.
I think we should be paying attention to green beans and dry, edible beans such as kidney
and pinto, because these crops also may be susceptible to some degree, he says.
Northarvest may escape
Carl Bradley, NDSU extension plant pathologist, says scientists dont believe dry beans are
as susceptible to Asian soybean rust as soybeans. However, this is based on observations, not
hard research data, he says.
Soybean rust will be something we need to look out for in dry beans, Bradley says.
The good news for Northarvest is that Asian soybean rust hasnt been found in Texas yet. It is overwintering further east, from Louisiana to Florida, on the leaves of kudzu plants. Most of the
plants disease and insects that are blown into North Dakota and Minnesota come from Texas.
A typical spring or summer jet stream pattern doesnt blow rust spores from Lousiana and
Alabama into the Northarvest region, he says.
More fungicides available
Fungicides labeled for rust control in dry beans will be effective against soybean rust, according
Officials from dry bean producing states are working together to get the fungicides labeled for
use on soybeans labeled for dry beans, too.
There is a chance that well have additional products available, Bradley says.
Management of Asian soybean rust will be similar to dry bean rust. The key will be to protect
plant leaves before they are infected.
The main difference is that we dont have any resistant varieties, Bradley says.
A typical spring or summer jet stream pattern doesnt blow rust spores from Lousiana
and Alabama into the Northarvest region. -- Carl Bradley, NDSU extension plant pathologist.