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Phytophthora citrophthora, also known as brown rot of citrus, is a soil borne oomycete that infects several economically important citrus crops. [1] A diagnostic symptom of P. citrophthora is gummosis, wherein lesions around the base of the tree exude sap. [2]
The important citrus-growing regions of California and the Mediterranean have not been affected. [1] The blight spreads through an infected tree, invading and colonizing the plant's roots, leaves, and trunk. As of 2020, neither the causal agent nor the spreading mechanism of the disease is known. [2]
Viral diseases; Citrus mosaic Satsuma dwarf-related virus: Bud union crease Virus for some combinations, otherwise genetic or unknown Citrus leaf rugose genus Ilarvirus, Citrus leaf rugose virus (CLRV) Citrus yellow mosaic genus Badnavirus: Crinkly leaf Crinkly leaf virus (strain of Citrus variegation virus) Infectious variegation
A major grower said this week it was abandoning its citrus growing operations, reflecting the headwinds Florida's signature crops are facing following a series of hurricanes and tree diseases.
Common hosts of this disease are citrus and herbaceous plants like sweet orange, grapefruit, mandarin, and Mexican lime. [3] Symptoms of infected hosts consist of interveinal chlorotic flecks and leaf mottling in younger tissues–in more severe cases these symptoms persist in older tissues. In mild cases, the bark of the trunk or limbs may ...
Tylenchulus semipenetrans, also known as the citrus nematode or citrus root nematode, is a species of plant pathogenic nematodes and the causal agent of slow decline of citrus. T. semipenetrans is found in most citrus production areas and diverse soil textures worldwide. Their feeding strategy is semi-endoparasitic and has a very narrow host ...
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 ...
Growing un-grafted citrons in Yemen has some associated difficulties, particularly since citron is a highly susceptible plant. [vague] The most common rootstock types that are currently used to graft citrus in Yemen are Sour orange (Citrus × aurantium) and Rough lemon (Citrus jhambiri), [12] which are very helpful to prevent exocortis in ...