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Botrytis cinerea spore balance of a greenhouse rose crop Inra
Boulard, T.; Chave, M.; Fatnassi, H.; Poncet, C.; Roy, J.C..
Fungal pathogens are among the most virulent bioagressors of protected crops. For sustainable plant production and to protect the crop against these airborne organisms one must determine their origin, i.e. whether they come from outside the greenhouse or are produced inside it.We considered Botrytis cinerea spore concentration as a particular physical species which is transported by air in the same way as heat, CO2, water vapour or any tracer gas. We constructed a mass balance of the viable Botrytis spores on the whole-greenhouse volume to assess the inside production of spores and their exchanges.The different elements in the spore balance are considered and are determined experimentally:• spore transfer into or out of the greenhouse is deduced from the...
Tipo: Journal Article Palavras-chave: GREENHOUSE; AIR EXCHANGE RATE; SPORE; BALANCE; VENTILATION; ROSE CROP.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008dc736418&uri=/notices/prodinra1/2011/04/
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Comportement d'une colonies d'abeilles à des températures extrêmes National Institute of Agronomic Research
Lenski, Y..
A study was made of the effect of high temperatures on thermoregulation in a honeybee colony and on the behaviour of the bees. Thermoregulation was limited to the brood-nest. Its temperature did not exceed 37·6°C while the ambient one was 48°C. The activity of forager bees continued in spite of the extremely high temperatures (up to 48°C). During the middle of the day this activity decreased, but it was resumed as a result of transport of liquids when the ambient temperature was still 47·O°C. The activity of ventilating bees at the hive entrance and the velocity of the air current were influenced by the fluctuation of the temperature of the brood-nest. The activity of water carriers was not affected directly by the ambient temperature but by that of the...
Tipo: Journal Article-postprint Palavras-chave: HONEYBEE; APIS MELLIFERA; APIDAE; HYMENOPTERA; SOCIAL INSECT; TEMPERATURE; THERMOREGULATION; BEHAVIOUR; FORAGING; VENTILATING; SUCROSE SOLUTION CARRIER; ABEILLE DOMESTIQUE; INSECTE SOCIAL; TEMPERATURE; THERMOREGULATION; COMPORTEMENT; BUTINAGE; VENTILATION; TRANSPORT DE SOLUTION SUCREE.
Ano: 1964 URL: http://hdl.handle.net/2174/449
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