To kill the white pine blister, the forestry department decided to apply pesticide to the trees. they must directly apply the selected pesticide to the trees' leaves. which method is the department using?
the forestry department
is using a(n)1 control method. this involves using a(n) method, in which department personnel will spray pesticide directly on the trees' leaves.

1.mechanical
chemical
biological

2.basal bark
cut-stump treatment
foliar spray

The forestry department is using a  1. chemical method. This involves using a  2.  foliar spray method, in which department personnel will spray directly on trees' leaves.

Explanation:

White pine blister is a fungal disease of plant caused by fungus Cronartium ribicola.This fungus infects the plant through the stomata of the leaves.There are several methods of controlling pests and pathogen in agriculture which include ; mechanical methods; chemical methods and Biological methods.Mechanical methods include constructing barriers, electrical fencing etc.The biological method include introduction of organisms that will suppress pathogen activity.Chemical methods include use of pesticides , that are poisonous chemical substance that will kill the pathogen.Here the forestry department decides to spray insecticides thus, they are using a chemical method. Secondly they are going to spray the insecticide on each leaf so they have chosen the method of foliar spray and not the cut stump treatment or basal bark method.