First Report of Root Rot of Pedunculate Oak and Other Forest Tree Species Caused by Phytophthora plurivora in the Czech Republic.

From 2006 to 2008, several similar Phytophthora isolates were obtained from roots of mature Quercus robur and other tree species (Acer platanoides, Fraxinus excelsior, Q. rubra, and Tilia cordata) in forests and parks in several areas in the Czech Republic. The trees were characterized by chlorotic and reduced foliage, crown dieback, and reduced root hairs.

First Report of Phoma exigua var. populi Causing Canker of Twigs and Shoots of Poplar in the Czech Republic.

During 2007 and the spring of 2008, a disease of poplars (Populus spp.) resembling the Dothichiza canker was found in plantations of fast-growing trees in central Bohemia and in southern Moravia where it was more abundant. The yellowish brown-to-brown, round or elongated cankers occurred on damaged shoots and twigs.

First Report of Leaf Spot, Shoot Blight, and Stem and Collar Canker of Rhododendron spp. Caused by Phytophthora citricola in the Czech Republic.

During the summer and autumn of 2006, a disease of rhododendron plants (Ericaceae) was found in nurseries and public gardens in several areas of the Czech Republic. Leaves of damaged plants showed dark brown-to-black lesions extending along the mid-rib and commonly spreading to petioles and shoots. The infected shoots turned black and died.

First Report of Impatiens necrotic spot virus in the Czech Republic.

Impatiens necrotic spot virus (INSV) was found for the first time in the Czech Republic in 1999 in Columnea sp. and Curcuma sp. plants that were imported.