Greenhouse Management
Glossary
V
VENLO GREENHOUSE – Venlo houses are ridge and furrow houses where the gable ends are very narrow. This narrow gable end allows for the use of narrower bars and wider, single panes of glass to be used on the roof. This type of construction allows for a high percentage of winter light to reach the crop.
VERMICULITE – Vermiculite is a common component and is a hydrated aluminum-iron-magnesium silicate material that has an accordion-like structure.
VERTICILLIUM – The verticillium fungus can infect about 300 different host plants, including many fruits, vegetables, trees, shrubs and flowers, as well as numerous weeds and some field crops. The fungus can survive in soil, and, once it becomes established in a field or garden, it may remain alive for 25 years or longer.
VIRUS – Viruses are microscopic parasites, generally much smaller than bacteria. They lack the capacity to thrive and reproduce outside of a host body.
VOLATILE – Evaporating rapidly; turning easily into a gas or vapor.
