Explore essential strategies, biology, and tactics for managing aphids in agriculture with this focused quiz. Perfect for growers looking to protect their crops effectively and sustainably.
Which characteristic is commonly used to identify aphids on crop plants in the field?
Explanation: Aphids are typically identified by their soft, pear-shaped bodies that are often green, black, or brown. They do not have hard shells, do not buzz like large insects, and do not burrow underground. The other options describe characteristics of different pest species.
Which beneficial insect is commonly introduced to help control aphid populations in agricultural fields?
Explanation: Lady beetles, also known as ladybugs, are natural predators of aphids. Cutworms and wireworms are pests, and Japanese beetles primarily feed on plant foliage, not aphids. Releasing lady beetles is a proven biological control method.
When is the most effective time to apply contact insecticides for aphid control?
Explanation: Applying insecticides when aphid numbers reach the economic threshold helps prevent unnecessary treatments and manages costs. Spraying weeks early or after harvest is ineffective, and spraying during rain reduces efficacy and increases runoff.
What symptom often indicates aphid infestation in plants?
Explanation: Aphids excrete a sticky substance called honeydew, leading to shiny or sticky leaves. Rapid root growth is unrelated, purple leaf spots are often fungal, and corky bark is not linked to aphids.
Selecting crop varieties with which feature supports aphid management?
Explanation: Planting varieties with genetic resistance makes crops less susceptible to aphid infestations. High sugar content or deep roots don't deter aphids, and early flowering is not directly linked unless it indirectly affects exposure time to aphids.