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Cause and Host Alternaria: Small water-soaked lesions, maturing into sunken and brown spots with or without a yellow halo. May show concentric rings with purple margins. Necrotic tissue may fall out to appear shot-holed. Leaf spot on many plants and crops. Septoria: Small brown spots, that turns light tan to white in the centre. Leaf spot on ...
Secondary or summer spores called conidia form in whitish patches on the undersides of leaves in tiny, concave fruiting bodies called acervuli. These conidia are horn-shaped and have hydrophilic outer cell walls that make them easily miscible in water. When spread during rain or by wind they can cause new leaf infections. [9]
California red scale (order Hemiptera: family Coccoidea) Aonidiella aurantii – A hard scale, orange to orange pink, the female covering being less than 1.5 mm across. Often in plague numbers this scale infests upper surfaces of foliage causing yellowing, leaf fall, and twig and branch dieback. Serious infestations can cause plant death.
The pathogens are spread by grass trimming equipment such as a lawn mower as they carry the plant debris that contains the scelerotia (13). In addition, the hyphae from an infected plant invade other nearby plants as they grow outside of roots and rhizomes (10). Black mycelium as known as “runner hyphae” grow on surface of infected roots ...
Snow mold is a type of fungus and a turf disease that damages or kills grass after snow melts, typically in late winter. [1] Its damage is usually concentrated in circles three to twelve inches in diameter, although yards may have many of these circles, sometimes to the point at which it becomes hard to differentiate between different circles.
Shot hole disease is a major concern of the stone fruit industry. It is estimated that 80% of the California almond crop may be infested with shot hole disease, resulting in a potential yield loss of 50-75%. [3] In the 1930s, it was found that applications of Bordeaux mixture reduces shot hole disease on peaches from 80% to 9%.
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Durians are an agricultural product affected by many plant pathogens and pests. Most of the information here concerns Durio zibethinus , the major commercial species, but a dozen species in the genus Durio are edible durians, and several of those are also grown commercially and these diseases can concern them as well.