--- title: Gray Mold description: Gray Mold -Botrytis cinerea Gray mold is a disease of potato foliage and tubers caused by the fungus Botrytis cinerea. The pathogen has a wide host range with reported incidences in more than 200 diff --- [Skip to content](https://knowledge.agro-scout.com/gray-mold#main-content) - [English](https://knowledge.agro-scout.com/gray-mold) - [Français](https://knowledge.agro-scout.com/fr/la-moisissure-grise) English Show submenu for translations [Contact us](https://knowledge.agro-scout.com/kb-tickets/new?hsLang=en) ![AgroScout\_logo\_Big\_High\_Resolution-(1).png\]](https://knowledge.agro-scout.com/hs-fs/hubfs/AgroScout_logo_Big_High_Resolution-(1).png?height=40&name=AgroScout_logo_Big_High_Resolution-(1).png) - [Default HubSpot Blog](https://8371915.hs-sites.com/blog) Open main navigation Close main navigation - [Default HubSpot Blog](https://8371915.hs-sites.com/blog) - - [English](https://knowledge.agro-scout.com/gray-mold) - [Français](https://knowledge.agro-scout.com/fr/la-moisissure-grise) English Show submenu for translations - [Contact us](https://knowledge.agro-scout.com/kb-tickets/new) - Go to agro-scout.com Go to agro-scout.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://knowledge.agro-scout.com/?hsLang=en) 2. [Resources](https://knowledge.agro-scout.com/resources?hsLang=en) 3. [Potatoes](https://knowledge.agro-scout.com/resources?hsLang=en#potatoes) # Gray Mold **Gray Mold -***Botrytis cinerea* Gray mold is a disease of potato foliage and tubers caused by the fungus Botrytis cinerea. The pathogen has a wide host range with reported incidences in more than 200 different hosts, some of which are used in rotation with potatoes. This wide host range causes a drastic increase in inoculum levels over time. The pathogen requires moist conditions in order to infect. Airborne spores carried by wind and rain infect ageing potato floral parts and leaves, particularly late in the growing season. The pathogen may also cause tuber rot. Gray mold is sometimes mistaken for late blight or early blight, but the grey-black to brown botrytis lesions on leaves and occasionally on stems will produce a characteristic greyish growth of mycelium and spores. Dense crop canopies greatly increase infection, especially on senescing or previously diseased plant parts. Heavy dew, fog, and frequent rain or irrigation increase gray mold severity. ![](https://knowledge.agro-scout.com/hubfs/image-png-Apr-26-2021-11-54-56-73-AM.png)   ![](https://knowledge.agro-scout.com/hubfs/image-png-Apr-26-2021-11-55-21-09-AM.png) - [Getting started with AgroScout](https://knowledge.agro-scout.com/getting-started-with-agroscout?hsLang=en#main-content) - [Getting Started](https://knowledge.agro-scout.com/getting-started-with-agroscout?hsLang=en#getting-started) - [Onboarding with AgroScout](https://knowledge.agro-scout.com/getting-started-with-agroscout?hsLang=en#onboarding-with-agroscout) - [AgroScout Sky App](https://knowledge.agro-scout.com/agroscout-sky-app?hsLang=en#main-content) - [Create, Save and Operate Scouting Missions](https://knowledge.agro-scout.com/agroscout-sky-app?hsLang=en#create-save-and-operate-scouting-missions) - [Image Uploading](https://knowledge.agro-scout.com/agroscout-sky-app?hsLang=en#image-uploading) - [Mobile App](https://knowledge.agro-scout.com/mobile-app?hsLang=en) - [AgroScout Web Platform](https://knowledge.agro-scout.com/agroscout-web-platform?hsLang=en) - [Troubleshooting](https://knowledge.agro-scout.com/troubleshooting?hsLang=en#main-content) - [Sky App Troubleshooting](https://knowledge.agro-scout.com/troubleshooting?hsLang=en#sky-app-troubleshooting) - [FAQ](https://knowledge.agro-scout.com/faq?hsLang=en#main-content) - [Drones and Flight FAQ](https://knowledge.agro-scout.com/faq?hsLang=en#drones-and-flight-faq) - [General FAQ](https://knowledge.agro-scout.com/faq?hsLang=en#general-faq) - [Reports](https://knowledge.agro-scout.com/reports?hsLang=en) - [Resources](https://knowledge.agro-scout.com/resources?hsLang=en#main-content) - [Webinars](https://knowledge.agro-scout.com/resources?hsLang=en#webinars) - [Potatoes](https://knowledge.agro-scout.com/resources?hsLang=en#potatoes) - [Soybean](https://knowledge.agro-scout.com/resources?hsLang=en#soybean) - [Corn](https://knowledge.agro-scout.com/resources?hsLang=en#corn) - [Agroscout LITE](https://knowledge.agro-scout.com/agroscout-lite?hsLang=en) - [Default HubSpot Blog](https://8371915.hs-sites.com/blog) [![Chill listening crop-3](https://knowledge.agro-scout.com/hs-fs/hubfs/AgroScout_logo_Big_High_Resolution-(1).jpg?width=77&height=24&name=AgroScout_logo_Big_High_Resolution-(1).jpg "Chill listening crop-3")](https://agro-scout.com/) agro-scout.com Help Center Copyright © 2026, AgroScout