Chapter 10 Diagnosis and plant disorders Flashcards
T/f information about a trees history and symptoms gained from a home owner can always be considered accurate
False
If a tree is not well suited for the site in which it has been planted, it may become ________ predisposing it to other problems.
Stressed
A common mistake in diagnosis is to carefully examine the above ground portion of the tree, while ignoring the __________
Roots
T/f if a tree declines or dies within the first year following installation, a likely cause is excess or insufficient water.
True
Leaf scorch, girdling roots and mineral deficiencies are examples of __________ disorders.
Abiotic
Name 5 causes of physical or mechanical injuries to trees.
Lawn mower/ string trimmer Vandalism Construction Rodents Guy wires
Insect damage to trees is usually the result of feeding or _____ ______
Egg laying
Name 5 insect pests of trees with chewing mouthparts. Name 5 with piercing or sucking mouth parts
Chewing Beetles Caterpillar Weevils Leaf miners Borers
Piercing/sucking Aphids Scales Leafhoppers Mealybugs Psyllids
Insects that carry plant pathogens are said to be
Vectors
T/f mites are not actually insects
True
Microscopic worms that sometimes feed on trees and may carry diseases are called
Nematodes
Name the 4 factors required for a tree disease
Susceptible host
Pathogenic organism
Suitable environment
Proper timing
T/f vascular diseases of trees are rarely fatal
False
T/f diseases that affect only the foliage of a tree may not be a serious problem unless defoliation occurs in several consecutive yrs
True
Most fungi cause plant disease
False
