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1. a highly flammable material, such as Greek fire, formerly used in warfare
2. lightning without audible thunder



an infectious disease of tobacco and Indian tobacco caused by the bacterium Pseudomonas tabacum. Wildfire is characterized by the appearance of numerous pale yellow chlorotic spots, reaching 2 cm in diameter, on the leaves and, sometimes, on the sepals and pods. The diseased areas desiccate in dry weather and rot in humid weather, which often leads to the perforation of the leaves. The causative agent of wildfire enters the plant through the stomata and damaged tissues. The bacterium is preserved in dust that has settled in drying sheds or clinged to seeds and to greenhouse stock; it is also preserved in the unrotted remains of a harvest. Wildfire decreases harvests by 40 to 50 percent. Prices for tobacco leaves drop by 80 percent when the leaves are diseased.

Control measures include using liquid disinfectants on seeds, disinfecting greenhouse stock, spraying seedlings with Bordeaux mixture during the phase of two true leaflets, and growing resistant varieties. The application of potash fertilizers and autumn plowing are also recommended.


Grushevoi, S. E. Bolezni tabaka i sistema meropriiatii po bor’be s nimi. Moscow, 1950.
Leonov, I. P., A. G. Petrenko, and G. M. Psarev. Posobie dlia tabakovodov. Moscow, 1968.



(plant pathology)
A bacterial disease of tobacco caused by Pseudomonas tabaci and characterized by the appearance of brown spots surrounded by yellow rings, which turn dark, rot, and fall out.
References in periodicals archive ?
More than 50 firefighters battled a 4-acre brush fire Wednesday afternoon on challenging terrain in Warren.
While the primary purpose was fire protection from flying ashes from a forest or brush fire, he found three other benefits:
Meanwhile in California, the last resort for homeowners seeking fire insurance in brush areas is the state's California Fair Plan Association, an assigned-risk program with 26,500 policyholders in areas where lightning has ignited brush fires in the hills since before there was a man or a woman on the planet--that is the way nature has always generated fertilizer (basically nitrates in the ash).
Over the years, brush fires have destroyed better than half of the young trees.
Schaumburg firefighters and Illinois State Police responded to a scattering of brush fires along the east side of Route 53 between Higgins and Golf roads near Schaumburg Thursday afternoon, police said.
Wildfires are fueled by low humidity, dry vegetation and gusty winds and weather conditions are favorable for additional brush fires throughout the state.
Dozens of children were among more than 300 people evacuated from campgrounds early Saturday morning as firefighters battled brush fires burning in Southern California's drought-parched foothills, fire officials said.
Hundreds of hectares had been burned by brush fires in the Valparaiso region.
John Hollows, a state firefighter based in the Douglas State Forest district, said it has been a slow year for brush fires because of fairly regular rainfall.
Weather forecasts had warned that the risk of brush fires would remain high in mountainous regions of Lebanon throughout Friday and Saturday due to warm temperatures.
Brush fires were reported southeast of the turn basin, which is approximately three miles from the launch pad.
The five agencies that dispatched 18 pieces of equipment, including fire trucks and bulldozers, on the scene added up to one of the largest brush fires in the county this year and Goshen's first significant brush fire of the summer, Wolting said.