Question

An apple grower notices that several of his apple trees with fungi growing on their trunks have developed necrotic ring spots, while other trees in the orchard that lack fungi appear healthy. What is the most likely conclusion the farmer can make about the virus infecting his apple trees?

The apple trees were infected by horizontal transmission.
The fungi carry disease.
The fungi attract disease-carrying insects.
The apple trees were infected by vertical transmission.

Answer 1

The apple trees were infected by horizontal transmission

Step-by-step explanation:

• When an infection is transmitted between the members of the same species however the transmission is not from parent to child, such transmission fo infection is referred to as horizontal transmission.
• Since the transmission of viral infection is taking place in the orchard amongst the same species that is, the apple trees, the transmission is horizontal.