There is a single class, Oomycetes, which is further divided into 7 orders. We shall study some genera belonging to the orders Saprolegniales, Pythiales and Peronosporales. Order Saprolegniales (Water Molds): The term 'water molds' is generally used for genera belonging to this order. The zoospores are formed in zoosporangia. A peculiar feature of this order is the production of two [...]
In this article we will discuss about:- 1. Occurrence of Phytophthora 2. Symptoms of Phytophthora 3. Predisposing Causes 4. Control of the Disease 5. Salient Features 6. Economic Importance. Contents: Occurrence of Phytophthora Symptoms of Phytophthora Predisposing Causes of Phytophthora Control of the Disease Caused by Phytophthora Salient Features of Phytophthora Economic Importance of Phytophthora 1. Occurrence of Phytophthora: The [...]
In this article we will discuss about the life cycle of phytophthora with the help of suitable diagrams. Mycelium of Phytophthora: It is profusely branched and consists of aseptate, hyaline, profusely branched, coenocytic, moderately thick hyphae about 4-8µ in diameter. The hyphal wall is approximately 0.1µ thick. It is electron transparent except for a thin, electron dense outer surface. Glucans [...]