Peronospora manshurica
| Peronospora manshurica | |
|---|---|
 | |
| Peronospora manshurica on soybean leaf | |
| Scientific classification | |
| Kingdom: | Chromalveolata |
| Phylum: | Heterokontophyta |
| Class: | Oomycetes |
| Order: | Peronosporales |
| Family: | Peronosporaceae |
| Genus: | Peronospora |
| Species: | P. manshurica |
| Binomial name | |
| Peronospora manshurica (Naumov) Syd., (1923) | |
| Synonyms | |
|
Peronospora sojae F. Lehm. & F.A. Wolf, (1924) | |
Peronospora manshurica is a fungal plant pathogen. It is a widespread disease on the leaves of soybeans[1] and other crop plants. The fungi is commonly referred to as downy mildew, "leafspot", or "leaf-spot".
Symptoms
The most visible symptoms of P. manshurica are pale green to light yellow spots that enlarge into pale to bright yellow lesions of variable size and shape. Lesions later turn grayish-brown to dark-brown with a yellowish-green margin that may eventually become entirely brown. Tufts of grayish to pale-colored sporangiophores on the underside of leaves easily distinguish the infection from other foliar diseases.[2]
Risk factors
The fungus spreads by oospores on diseased leaves and/or on infected seed. The disease spreads in environments with high humidity and favors temperatures between 20-22 °C.[1]
Control
The disease is often controlled using fungicides such as mancozeb, maneb, or zineb.[1]
References
- 1 2 3 Shanmugasundaram, S.; Yeh, C.C.; Hartman, G.L.; Talekar, N.S. (1991). Vegetable Soybean Research Needs for Production and Quality Improvement (PDF). Taipei: Asian Vegetable Research and Development Center. pp. 86–87. ISBN 9789290580478. Retrieved 6 February 2016.
- ↑ Sinclair, James Burton; Backman, P. A. (1989). Compendium of Soybean Diseases (3rd ed.). St Paul, MN: APS Press. ISBN 9780890540930.
Further reading
Silva, O.C.; Santos, H.A.A.; Dalla Pria, M.; May-De Mio, L.L. (June 2011). "Potassium phosphite for control of downy mildew of soybean". Crop Protection 30 (6): 598–604. doi:10.1016/j.cropro.2011.02.015.