Category: Bacterial leaf spots

Growing Roses? Export Rules to the U.S. Have Changed.

In the efforts to prevent a quarantinable strain of Ralstonia from entering the United States, USDA-APHIS has changed importation rules for rose material for planting. This includes rose material coming from Canada.

Under the new federal order, roses (Rosa spp.) grown in Canada must now have been grown entirely within Canada or the U.S.. This includes root stock and graft material.

This is to reduce a potential pathway for Ralstonia solanacearum Race 3 biovar 2 (Rs R3bv2) into the U.S., which can devastate solanaceous crops such as potato and tomato, as well as geraniums.

Read on for more details about RS R3bv2 and the new export regulations.

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Which Pathogens Should You Worry About in Your Water?

This is the second blog post in a series about water sanitation. The goal of this series is to get you reflecting on your own irrigation system before you are faced with a problem.  Posts over the next few weeks will focus on identifying problems, interpreting lab tests, on-farm disease monitoring, and water treatment options.  These will be good refresher resources, so make sure to bookmark them.

When it comes to talking about disease-related issues in greenhouse crops, one point of confusion is often oven WHICH pathogens CAN be transmitted by water.  Some are obvious – we all know Pythium is water-borne.  But what about other culprits, like Fusarium or Erwinia? Should you worry about these in your recirculating water?

Read more to find out when to suspect your irrigation water versus other factors when it comes to disease.

Continue reading “Which Pathogens Should You Worry About in Your Water?” →