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Phaeocryptopus gaeumannii is a fungus that infects Douglas fir and causes Swiss needle cast, a yellowing of foliage and reduction in growth. It is indigenous to western North American stands of Douglas fir, but was first discovered in Douglas fir trees planted Switzerland. When trees in America were checked, it was found that the fungus was ...
The virus specifically targets carrots, parsnips, and cilantro but only effects carrot as this is the only host for the vector. This virus alone does not cause symptoms in carrots, but in connection with Carrot red leaf virus (CRLV) causes yellowing, reddening of leaves and yield loss.
Citrus greening is distinguished by the common symptoms of yellowing of the veins and adjacent tissues (hence the "yellow dragon" name given by observing Chaozhou farmers as early as the 1870s [1]); followed by splotchy mottling of the entire leaf, premature defoliation, dieback of twigs, decay of feeder rootlets and lateral roots, and decline in vigor, ultimately followed by the death of the ...
It is found everywhere bananas are grown in Africa, Asia, Central and South America. It attacks banana plants of all ages and spreads mainly through the soil. It causes wilting and yellowing of the leaves. [7] F. oxysporum f. sp. lycopersici causes vascular wilt in tomato. The disease starts out as yellowing and drooping on one side of the plant.
In the early stages, MLND causes long yellow stripes on leaves. Unlike maize streak virus disease though, the streaks of MLND are wider. As the disease advances, the maize leaves become yellow and dry out from the outside edges towards the midrib. MLND can also cause dwarfing and premature aging of the plants.
Other causes can include acid reflux, asthma, allergies, or other chronic medical conditions, adds Richard Watkins, M.D., an infectious disease physician and professor of medicine at the Northeast ...
Fiorinia theae, the tea scale, is a polyphagous scale insect which is native to Asia and has been introduced into the Americas.It is widely distributed on both continents, especially in warmer regions.
The damage causes many effects that help to diagnose and characterize the disease. The name of the disease comes from the symptom which occurs in older plants, in which the new leaves that are produced are narrower than normal, yellow, and flat, which causes a "bunchy" appearance at the top of the tree. [ 2 ]