Illinois Field Crop Applicators Practice Test

What is the lifecycle stage of the alfalfa weevil described as being up to 1/2 inch long with a dark heel and a green stripe?

1. Egg

2. Larvae

3. Pupa

4. Adult

The correct answer is: Adult

The lifecycle stage described as being up to 1/2 inch long with a dark heel and a green stripe refers to the adult stage of the alfalfa weevil. In this stage, the adult weevils are typically identifiable by their size and distinctive coloration, which includes the dark heel and green stripe. This adult form is crucial as it is responsible for mating and laying eggs, which begins the lifecycle anew. Understanding the characteristics of each lifecycle stage is important for effective pest management. The eggs are much smaller and are not visible to the naked eye. The larvae, while also small, lack the adult's distinctive markings and are primarily a threat in terms of feeding damage. The pupal stage is a transitional phase where the larvae are encased and do not exhibit the features of adult weevils, unlike the clear identification of an adult stage. Recognizing the adult alfalfa weevil is key for timely interventions, as this is the stage that can lead to significant infestations in alfalfa crops if not managed properly. Proper identification helps ensure that pest control measures are applied effectively at the right time, enhancing the overall health and yield of the crop.