Illinois Field Crop Applicators Practice Test

What can result from spider mite infestations on soybean plants?

1. Increased pod count

2. Leaf curling and yellowing

3. Species cross-contamination

4. Enhanced photosynthesis

The correct answer is: Leaf curling and yellowing

Spider mite infestations on soybean plants typically lead to visible symptoms such as leaf curling and yellowing. This occurs because spider mites feed on the plant's sap, which disrupts the plant's normal physiological processes. The feeding action typically drains nutrients and moisture from the leaves, causing them to exhibit curling as they lose turgor pressure and turn yellow due to chlorosis. Over time, severe infestations can lead to premature leaf drop and a reduction in overall plant health, impacting yield and vitality. This highlight of physiological stress showcases the detrimental effects of pest infestations on crops, which is crucial for understanding pest management in agriculture. Other potential outcomes mentioned in the other options, such as increased pod count, species cross-contamination, or enhanced photosynthesis, do not occur as a direct result of spider mite damage. In fact, the stress inflicted by spider mites generally negatively impacts plant growth and productivity, rather than enhancing it in any form.