Learning in host selection in Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)

Area of Science:

• Entomology
• Animal Behavior
• Insect Ecology

Background:

• Helicoverpa armigera is a polyphagous agricultural pest.
• Host selection is crucial for insect survival and reproduction.
• The role of learning in insect host selection is not well understood.

Purpose of the Study:

• To investigate the effect of prior experience on host selection in adult female Helicoverpa armigera.
• To determine if Helicoverpa armigera exhibits learning in its host selection behavior.
• To provide evidence for learning in moths and discuss its implications.

Main Methods:

• Adult female Helicoverpa armigera were exposed to either tobacco or tomato plants (or no experience) for three days.
• Host selection was assessed in indoor flight cages and a large greenhouse.
• Post-alighting acceptance of hosts was tested for moths captured in the greenhouse.

Main Results:

• Prior experience significantly influenced both pre-alighting (host finding) and post-alighting (host acceptance) behaviors.
• Moths showed modified host selection based on their previous experience.
• This modification in behavior is attributed to learning.

Conclusions:

• This study presents the first detailed evidence of learning in moths (Helicoverpa armigera).
• Learning affects host selection in ovipositing moths, influencing both initial choices and acceptance.
• The findings have implications for understanding insect pest behavior and control strategies.