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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 ?
This legislation would fund wildfires as natural disasters and protect the agencies fire prevention budget by putting a freeze on the rising budget costs of the 10-year average.
Wildfires can breakout easily, where anything from campfires to dropping a match can ignite a conflagration.
The NI Wildfire Stakeholders Group, which consists of representatives from government agencies, environmental Non-Government Organisations (ENGOs) and landowners, considers that the best way forward to tackle the issue of wildfires in NI is to have an agreed and co-ordinated strategic approach which we can all jointly work towards.
Wildfires are known to move at speeds of up to 14 mph, which means they have the ability to spread quickly, potentially overtaking anything in their path - endangering life, property, and forestland.
Cal Fire has announced that more than 115,000 acres have burned in the wildfires that have sprung up over the last few days.
So, have wildfires actually increased globally, or does it just seem that way because we're tuned in more to bad news and social media?
PCS estimated the insurance industry loss from the Fort McMurray wildfires at C$3.
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DJI said unauthorized drones near wildfires can pose a hazard to firefighting airplanes and helicopters, and in some cases they have forced aerial firefighting operations to be suspended.
Wenatchee has been selected as one of three communities across the nation that applied to receive technical assistance under a new program that helps reduce wildfire risk and costs.
Keep track of current wildfires with the real-time wildfire map.
Years ago, many people wrongly believed (and some still do to this day) that lightning is the leading cause of wildfires.