Prevalence of pest nematodes associated with soybean () in Wisconsin from 1998 to 2021.

The prevalence of and other cyst and vermiform genera was determined from 8,009 soil samples over two decades. Prevalence of cyst nematodes for farms increased from 16% in 1998 to 1999, reaching a peak of 40%, with marked differences among Wisconsin's nine agricultural districts in how much the odds of a positive test increased. Estimates at the sample scale also increased over time but peaked at 29%.

Impact of on Soybean Grown in Wisconsin, U.S.A.

Models were developed to quantify the impact of to the early season growth and yield of soybean in field and greenhouse environments and to estimate yield loss because of . in Wisconsin. There was a negative linear relationship between initial nematode population densities () and shoot and total plant weight at V2 and yield, pod number, seed number, and seed mass at harvest in the field.

, a new nematode species (Pratylenchidae: Tylenchomorpha) from the Great Plains region of North America.

is a new species of root-lesion nematode described from corn-soybean production fields in the Central Great Plains of North America. It is characterized by populations with relatively abundant males, two lip annuli, females with a round functional spermatheca and a conoid to subcylindrical tail with a non-crenate, smooth terminus. In host preference tests, corn and wheat produce the largest nematode populations, whereas sorghum and soybeans produce less than 20% the numbers observed on corn.

Difference in lesion formation by male and female .

induce necrotic lesions, the hallmark symptom for the genus, soon after infection. The objective of our study was to characterize and quantify gender differences in lesion development. Independent experiments were conducted for three hosts; pea ( L.

Intraspecific variation in phenotypic and phylogenetic features among isolates from Wisconsin, USA.

is a common and important agricultural pest in Wisconsin, a USA state with a diverse agriculture. We compared populations from around the state to each other and to data published for populations around the world to gain insight on the variability of features important for identification of this cosmopolitan species. Thirteen isolates from samples collected in soybean fields in ten Wisconsin counties were established in monoxenic cultures.