Online Pesticide License Recertification Seminar Series: Black Dot and Fusarium

Controlling latent infections of black dot with early fungicide applications, 11:00-11:30, Speaker: Lydia Tymon
Colletotrichum coccodes causes black dot, which can lead to reduced tuber yield and quality. Although this disease has been studied for many years, black dot continues to be a challenge to manage because the fungus can infect its hosts without causing symptoms. Chemical management tactics such as fumigation and in furrow applications have been shown to be ineffective. Applications of azoxystrobin prior to infection can significantly reduce incidence of sclerotia on stems and tubers while no significant reduction of stem disease incidence has been observed when treatments are applied post-infection. However, it is not clear how early infection of potato seed or plants occurs. This seminar will discuss the timing of latent infections in potato and how earlier fungicide applications affects disease progression.

Using all the tools in the Fusarium management toolbox, 11:30-12:00, Speaker: Jeff Miller
This presentation will discuss the disease cycle of Fusarium dry rot as it relates to seed piece decay and dry rot in storage. The importance of all management practices, including seed handling and fungicide seed treatment, will be discussed. The importance of understanding the Fusarium species causing disease and the difference in symptoms caused by the two primary Fusarium pathogens (F. sambucinum and F. coeruleum) will be addressed. A comparison of varieties and their susceptibility to Fusarium dry rot will also be covered. Fungicides referenced in this presentation include mancozeb dust, CruiserMaxx Potato Extreme, CruiserMaxx Vibrance, Emesto Silver, Quadris, Maxim, Maxim MZ, STartUP MANZ, STartUP Fludi, and Spirato.

Please contact AMS.MountVernon@wsu.edu for Zoom details.