I Insects, such as greenfly and blackfly, are Invariably present in small populations on 1 almost all plants during the growing season, , and it is important to control them not only because they can debilitate plant material
> Very quickly with a rapid population build-up but also because they may carry virus diseases.
' In a propagating area the most useful , method of applying insecticides is by using lorosols, preferably in the evening. The most
> effective are those containing pirimicarb, pyrethrum, bioresmethrin or malathion. Do not spray with these chemicals when the i plants are exposed to direct sunlight.
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