tomato leaf with spider mite damage Early-career professional entomologist Rebecca Schmidt-Jeffris, Ph.D., specializes in research on mite pests of crops and their biological control. This the small yellow spots on this tomato leaf indicate early stages of damage by spider mites. Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed. Subscribe to Entomology Today! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Search Search for... Search Get Certified!