Coryneum or shothole blight. For the other fungal plant disease called 'shothole disease', see Cherry leaf spot. No results could be secured relative to the amount of fruit infection, since the crop was destroyed by frost. Lesions are rarely found on apricot twigs ; and, in consequence, these twigs are seldom killed by the disease even though most of the buds are affected. Microfungi on land plants:
The experience with apricots is a case in point. In our experiments, the fungus S. No growth was observed. Bordeaux mixture applied when the blossoms were emerging from the buds reduced both leaf and blossom infection. Otherwise, high levels of inoculum may develop and overwinter on the trees, infecting leaves the following spring. October 18, 91 per cent ; Novem- ber 6, 93 per cent ; and November 18, 95 per cent.
They usually occur later in the summer after leaf spots are evident. The fungus Stigmina carpophila isolated from damaged leaves of Prunus persica formed. Chlamydospores were single, termi-. Hosts include almonds, Catalina and Japanese flowering cherries, English laurel, ornamental plums, nectarines, peaches, and especially apricot. No growth was observed. See our Home page , or in the U. At cooler temperatures, long -.
In certain eases buds located in the axils of leaves are blighted at the time leaves are infected. In examining the relation of these separate disease waves to rainfall we see that despite several fairly heavy rains during October and November, no disease resulted. Remove and dispose of any infected buds, leaves, fruit and twigs. The experiments of therefore included a much earlier spray than those of After entering the host the germ tube continues to grow and give rise to mycelium.