Powdery Mildew Pathogens: Podosphaera (=Sphaerotheca) pannosa, Podosphaera tridactyla, and P. leucotricha Typical symptoms of powdery mildew include russeting on almond hulls. The symptoms are reminiscent of rusty spot on peach fruit caused by Podosphaera leucotricha but without the typical powdery...
Brown Mite Scientific name: Bryobia rubrioculus Brown mites overwinter in the egg stage. Eggs are red and spherical but do not have a stipe rising from the top. Newly hatched brown mites have six legs and are bright red. After they molt...
Anthracnose Pathogen: Colletotrichum gloeosporioides Penz. Blossom end of ripe fruit softens and orange spore masses seep out. Infected green fruit do not show symptoms until they ripen, and so the disease is nick-named “ripe rot”. The fungus overwinters on twigs....
Cane Blight Pathogen: Leptosphaeria coniothyrium The fungus overwinters on infected dead canes. In the spring spores are blown, splashed by rain, and carried by insects to nearby canes. Under moist conditions the spores germinate and enter the plant through pruning...
Cherry Leaf Curl Pathogen: Taphrina deformans or cerast The fungus also affects peach and nectarine trees. The fungus spreads on water, sticking in the cracks of the tree’s bark and on newly developing buds. As the weather warms, the spores...
Black Scale Scientific Name: Saissetia oleae Female black scales reproduce without mating and lay 1,000 to 2,000 eggs over a period of 2 to 3 months, mainly during May and June and again from October through November in areas with...
Cane Blight Pathogen: Leptosphaeria coniothyrium The fungus overwinters on infected dead canes. In the spring spores are blown, splashed by rain, and carried by insects to nearby canes. Under moist conditions the spores germinate and enter the plant through pruning...
Anthracnose Pathogen: Elsinoe ampelina All succulent parts of the plant, including fruit stems, leaves, petioles, tendrils, young shoots, and berries, can be attacked, but lesions on shoots and berries are most common and distinctive. Symptoms on young, succulent shoots first...
