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(plant pathology)
Any of various fungus diseases of plants characterized by yellowing of the leaves which later turn brown, become brittle, and die; affects cabbage, lettuce, cauliflower, peach, sugarbeet, and other plants.



diseases of plants— such as aster, celery, and peach yellows; witches’-broom of delphinium; purple top wilt of potato; and big bud— caused chiefly by mycoplasma-like organisms and by viruses.

Diseased plants are stunted and chlorotic, with many lateral shoots pressed to the main stem. The flowers have elongated sepals, deformed corollas that turn green, and an ovary that germinates into leaflets. Yellows attack many plants (potato, clover, onion, carrot, ornamentals). The reservoirs of the causative agents are weeds such as dandelion and field sow thistle. The disease is transmitted by various species of cicadas after the incubation period of the causative agent in their bodies and also by aphids. Yellows decrease the yields of greens, fruits, and seeds and impair the ornamental qualities of flowering plants. Some yellows (for example, cabbage yellows) are caused by fungi. The symptoms of these yellows are yellowing, wilting of leaves, and premature death of the plant. Control measures include crop rotation, cultivation of resistant varieties, removal of diseased plants, and control of weeds and disease carriers.


Smith, K. Virusnye rastenii. Moscow, 1960. (Translated from English.)
Ryzhkov, V. L., and A. E. Protsenko. Atlas virusnykh bolcznei rastenii. Moscow, 1968.
Ploaie, P., R. G. Granados, and K. Maramorosch. “My coplasma-like Structures in Periwinkle Plants With Crimean Yellows, European Clover Dwarf, Stolbur, and Parastolbur.” Phytopathology, 1968, vol. 58, no. 8, p. 1063.


References in classic literature ?
Oh, I don't mind it in the least," returned the yellow hen.
The yellow hen flew to the sands at once, but Dorothy had to climb over the high slats.
Don't forget, monsieur, that there is no chimney in The Yellow Room.
We have, without interrupting him, allowed Daddy Jacques to recount to us roughly all he knows about the crime of The Yellow Room.
As we talked we had been approaching the entrance to the cave, and as we crossed the threshold I ceased to wonder that the ancient green enemies of the yellow men had been halted by the horrors of that awful way.
In the meantime," I continued, "I may discover some means of winning my way alone to the land of the yellow men, but if I am unsuccessful one life only will have been sacrificed.
Dorothy told the girl Ruler how successful they had been in their quest until they came to the item of the yellow butterfly, which the Tin Woodman positively refused to sacrifice to the magic potion.
The Winkies were sorry to have them go, and they had grown so fond of the Tin Woodman that they begged him to stay and rule over them and the Yellow Land of the West.
Valdez throw away yellow silk, and I take for my arrows so rain not wash off poison.
Just then Toto, who had been growling to himself in a cross way, gave a sharp bark and flew at the yellow hen, who ruffled her feathers and let out such an angry screech that Dorothy was startled.
Yellow Handkerchief approached me, and, pointing out his village on the Point Pedro beach, gave me to understand that if I turned the Reindeer in that direction and put them ashore, they, in turn, would go to bailing.
It is dull work giving orders and trying to describe the bright visions of one's brain to a person who has no visions and no brain, and who thinks a yellow bed should be calceolarias edged with blue.