![]() Power washing benches and replacing floor mats are important steps to take to reduce the pathogen that is available to infect future crops. Sanitation can limit disease and includes removing plant debris and disinfesting production surfaces. The second challenge is eradicating Phytophthora once it has been introduced. Infected plants treated with fungicides may appear healthy until the fungicides wear off and Phytophthora increases. Also, plants may not exhibit obvious symptoms until the infection is well established or the plant becomes stressed (e.g., over- or underwatering). This is particularly difficult with floriculture crops because of the widespread distribution of prefinished plants. First, Phytophthora must be kept out of the production site. This type of symptom is especially noticeable on English ivy and African violets.Ĭontrolling the spread of Phytophthora spp. In some cases, the crowns will be the first plant part to become infected, after which the infection will move up the stem into the foliage near the petiole. Infected foliage will have a water-soaked, dark necrotic area. Symptoms include brown-black cankers at the soil line and diseased roots. Losses can be especially severe where ample water and warm temperatures favor disease epidemics. Phytophthora drechsleri may infect poinsettias (Photo 4). Phytophthora nicotianae can infect snapdragon (Photo 2), fuchsia, verbena (Photo 3), bacopa, vinca, African violet and dusty miller, to name a few. Two types of Phytophthora ( Phytophthora nicotianae and Phytophthora drechsleri) are usually found in floriculture crops and can cause root, crown and foliar blights. It can spread quickly in a greenhouse, especially in flood floor and hydroponic systems. Phytophthora (Photo 1) is a water mold and can be a particularly devastating and difficult-to-control problem, especially under wet conditions.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |