Assertion: aphid's number | /r/Causes | damage
Facets:
value: by the excessive removal of food
type: MANNER
Source sentences:
text: A large number of aphids on the growing shoots of a plant can cause damage, partly by the excessive removal of food that would otherwise pass to the growing leaves, partly by the digestive action of the saliva injected and also by introducing virus diseases from one plant to another, particularly in the potato, sugar beet and sugar cane.