Protecting plants during propagation can be a challenge, especially during spring production because of the large variety of bedding plants produced. Unrooted cuttings and young seedlings generally require warm temperatures along with frequent misting or high humidity so they can root into the planting media. This warm, humid environment provides optimal conditions for spores of pathogenic agents to germinate, invading wounds and tender plant tissue. It’s important to scout diligently for various diseases that can threaten propagated plants.

Botrytis cinerea

Foliar blights caused by Botrytis cinerea appear as small, light brown spots, tiny flecks or v-shaped, tan-brown lesions on flowers. Once established, gray mold can quickly spread throughout the crop and production area.

Leaf spots

Propagated plants are at risk of developing leaf spots by Alternaria, Colletotrichum and Myrothecium spp. Although they vary in shape and size depending on the pathogen, most leaf spots will appear as round, dead areas with defined margins and a colored border scattered over leaf surfaces. Under certain environmental conditions, some may form small, black fruiting structures within the leaf spot that can be examined more closely under a light microscope.

Phytophthora

There are numerous Phytophthora spp. pathogens that can affect young plants when the growing media is wet for a prolonged period of time. They are responsible for causing root and stem rots, cankers, as well as foliar blights. While many prefer warm-to-high temperature conditions (70 – 90°F), others like Phytophthora ramorum thrive in cool-to-moderate temperatures (36 – 79°F, 68°F optimum).

Put a Plan in Place

Even the most detailed inspection process can’t prevent all diseases. However, by carefully planning and preparing for the expected and unexpected, you can help prevent plant damage and stress.

Be sure to follow an agronomic program that provides a framework for rotating products with different modes of action, like Mural^®, Subdue Maxx^® and Postiva^® fungicides. This not only helps target a variety of diseases, but also practices proactive resistance management. Download our spring bedding plants agronomic program for a full product recommendation schedule for propagated plants such as the one below.

A successful growing season starts with healthy propagated plants. Stay ahead of problems and ensure the production of a high-quality crop with routine scouting and an agronomic program for common ornamental diseases.

Learn more about Syngenta agronomic programs at GreenCastOnline.com/Solutions.