Define the term economic threshold as it relates to pest control. What is cosmetic spraying and insurance spraying?
What will be an ideal response?
"Damage should be deemed significant only when the economic losses due to the damage considerably outweigh the cost of applying a pesticide. This point is called the economic threshold. If significant damage is not occurring, natural controls are already operating, and the situation is probably best left as is."
"Even if there is no evidence of immediate damage from a pest, a grower who believes that his or her plantings are at risk is likely to resort to insurance spraying: the use of pesticides to prevent losses to pests."
"Growers know that blemished produce means less profit, so they indulge in cosmetic spraying: the use of pesticides to control pests that harm only the item's outward appearance."
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The formation of raindrops by collision and coalescence of smaller cloud droplets is strongly influenced by:
A) dew point temperature of the cloud. B) number of droplets in the cloud. C) electrical charges on the droplets. D) solar radiation. E) presence of dust.
Global climate change in the Far North is most acute in the ________
A) Spring B) Summer C) Autumn D) Winter
What types of rocks would be common in the volcano in this figure?
A. felsic and intermediate lava flows B. volcanic domes C. welded tuff D. nonwelded tuff E. All of these choices are correct.
Geologists are able to study processes that form rocks here on Earth and then use this information to help interpret the geologic history of other planets.
Answer the following statement true (T) or false (F)