FREE Certified Arborist Diagnosis and Treatment Questions and Answers
What's the name for a large area of dead tissue on a leaf that has an irregular shape?
Explanation:
A large, irregularly formed patch of dead tissue on a leaf is called a leaf blotch. The most common causes of blotches are insects, sunburn, chemical spray, fungus, dryness, and frost. Dieback is the progressive withering of leaves and twigs from the tip back down to the base. It usually results from root damage, vascular disease, air pollution, or certain nutrient imbalances. Scorch is characterized by the browning and blackening of leaves as well as the dying of the surrounding tissue. Gummosis is the condition where gum or sap leaks from cuts or other bark holes.
An irregular plant growth that is frequently found in the leaf tissue is also known as:
Explanation:
Irregular plant growths called galls are frequently found in the tissue of leaves. Numerous pests, including as nematodes, fungus, bacteria, and mites, can cause galls. Dead tissue areas on foliage are referred to as blotches or spots, although blotches are larger than spots. Browning and death between the veins or along the margins of the leaf are symptoms of leaf scorch.
According to the integrated pest management system, which of the following is NOT a characteristic of a pest?
Explanation:
An organism would not be considered a pest in an integrated pest management system just because it needs intervention. Not all of the insects that the integrated pest management system classifies as pests require prompt treatment. Contextual awareness is one of IPM's distinguishing characteristics; an organism may be classified as a pest in one circumstance but not in another. If an organism competes with desirable plants for nutrients and water, it is generally regarded as a pest. Likewise, an organism will be deemed a pest if it jeopardizes the well-being or aesthetic appeal of a desired plant. Any organism that reduces a tree's usefulness, safety, or suitability for recreation could be regarded as a pest.
What is the term for plant growth regulators that inhibit the action of cell-elongating hormones?
Explanation:
Anti-gibberellins are plant growth regulators that block the action of hormones that lengthen cells. These substances can be injected into trees, sprayed on leaves, or mixed with the ground. They have been demonstrated to significantly slow down the tree's development, negating the need for expensive and time-consuming pruning. Nonetheless, there are still worries over anti-gibberellin cytotoxicity, thus arborists are recommended to use the least amount required.
Which condition listed below is an abiotic disorder?
Explanation:
Girdling roots are an abiotic disorder that refers to nonliving. Girdling roots occur when roots constrain one another by growing around one another. Weak vegetative development on the lateral branches extending down one side of the tree is a typical indication of girdling roots. The xylem becomes discolored as a result of vascular wilt disease. A vascular wilt illness impedes the flow of nutrients and water, ultimately resulting in the death of the tree. Some nematodes, which are small roundworms, consume plant tissues. Arachnids called mites occasionally inhabit and consume plant parts. Mites can suck the fluids from the leaves and stems of plants or cause galls on them to form reproductive structures.
What is the primary objective of insect pest control in the Plant Health Care model?
Explanation:
Suppression is the most common objective of insect pest control in the Plant Health Care model. Put differently, the goal is to reduce, but not completely eliminate, pests. Suppression is the method of choice for arborists because it uses fewer chemicals and doesn't shock the tree severely. Really, eradication is only a viable option for the most hazardous and aggressive pests. Plant healthcare professionals strive to avoid pest infestation and plant damage whenever feasible to minimize the need for additional interventions.
Frass, often found in trees, is a combination of insect waste and what other substance?
Explanation:
Sawdust mixed with insect waste is called frass. Frass presence is frequently a sign that there is a problem with the tree. Frass does, however, have some use for trees. It has amoebae, fungi, and beneficial microorganisms that encourage blossoming. Moreover, frass aids in the cycling of nutrients.
What establishes the kind of damage an insect causes to a tree?
Explanation
The type of damage an insect will cause to a tree depends on its mouthparts. As an example, certain insects chew solely on leaves, while others only eat the edges of the leaf, and still others eat the leaf whole. Certain insects devour the xylem, cambium, and phloem found inside tree trunks. Lastly, several insects puncture the leaves with their pointed mouthparts to extract the liquid within. In the latter instance, it might not be easy to see the tree's harm until it is almost too late.
The main purpose of wound dressing is:
Explanation:
The improvement of appearance is the main purpose of wound dressing. Wound dressings were once employed to stop illnesses from spreading and decaying, however many of these claims have been proven to be false. Although further research is required to confirm these claims, some data suggests that employing specific wound coverings may help prevent opportunistic insects that spread oak wilt from discovering wounds. Wound dressings are therefore virtually exclusively employed to enhance the tree's look and are relatively rarely utilized now. If an arborist decides to apply a dressing, he or she should make sure the material won't harm the tree and that it's administered sparingly.
Which of these DOES NOT typically make up a pest biological control strategy?
Explanation:
Using poison in a biological control strategy for pests is uncommon. An arborist using a biological management approach enlists the help of a pest's natural enemies, like as parasites, viruses, or predators. There are three possible approaches to this strategy: introduction, conservation, or augmentation. In other words, the population of controlling agents may be increased, maintained, or enhanced by adding organisms from the lab or other natural settings. Alternatively, the controlling agent may be introduced into the environment to reduce the population of the pest.
What term is used to describe insects that carry plant pathogens?
Explanation:
Vectors are insects that carry plant pathogens. The existence of vectors has the power to escalate a minor insect issue into a major emergency. Bark beetles are responsible for the spread of Dutch elm disease from tree to tree, as one common example. Nematodes, on the other hand, are microscopic, tubular organisms that interact negatively and positively with plants. Nematodes, for example, play a crucial role in the breakdown of organic matter. While certain species are effective in getting rid of pests, others harm tree roots. Galls are black, uneven areas on leaves that are usually the result of bacteria, fungi, or illness. A herbivore is an animal that only eats vegetation.