Articles
BOTRYTIS SPORE BALANCE OF A GREENHOUSE ROSE CROP
Article number
719_68
Pages
587 – 596
Language
English
Abstract
Fungal pathogens are among the most virulent bioagressors of protected cultivations.
In a context of sustainable plant production, the crop protection against these airborne organisms requests determining their origin, i.e. if they come from outside or if they are produced inside the greenhouse.
We have therefore considered the 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 and performed a spore balance of the finite volume of the whole greenhouse to assess the inside production of spores and their exchanges.
The different elements of the spore balance are considered and experimentally determined.
The transfer of spores into or from the greenhouse is deduced from the difference between inside and outside spore concentration, measured by spore traps, multiplied by the whole greenhouse ventilation rate.
Deposition of spores on the soil and the crop and their impact with plants is deduced from observations on Petri dishes. Spore production in the greenhouse is deduced from the whole greenhouse volume spore balance.
The first measurements and calculations have shown that: the presence of insect proof nets on the openings deeply influences the spore balance as the nets intercept Botrytis cinerea spores proportionally to net solidity.
Based on wind tunnel experiments, the law of spore interception by the nets was thoroughly studied and the whole model consequently completed.
First results are presented for a young rose crop.
It is shown that the origin of the inoculums is predominantly internal (2/3) but can vary considerably from one period to another.
In a context of sustainable plant production, the crop protection against these airborne organisms requests determining their origin, i.e. if they come from outside or if they are produced inside the greenhouse.
We have therefore considered the 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 and performed a spore balance of the finite volume of the whole greenhouse to assess the inside production of spores and their exchanges.
The different elements of the spore balance are considered and experimentally determined.
The transfer of spores into or from the greenhouse is deduced from the difference between inside and outside spore concentration, measured by spore traps, multiplied by the whole greenhouse ventilation rate.
Deposition of spores on the soil and the crop and their impact with plants is deduced from observations on Petri dishes. Spore production in the greenhouse is deduced from the whole greenhouse volume spore balance.
The first measurements and calculations have shown that: the presence of insect proof nets on the openings deeply influences the spore balance as the nets intercept Botrytis cinerea spores proportionally to net solidity.
Based on wind tunnel experiments, the law of spore interception by the nets was thoroughly studied and the whole model consequently completed.
First results are presented for a young rose crop.
It is shown that the origin of the inoculums is predominantly internal (2/3) but can vary considerably from one period to another.
Publication
Authors
T. Boulard, M. Chave, H. Fatnassi, C. Nieto, C. Poncet
Keywords
greenhouse, air exchange rate, spore, balance, Botrytis cinerea, ventilation, rose
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