Grass thrips (Anaphothrips obscurus) (Thysanoptera: Thripidae) population dynamics and sampling method comparison in...

Area of Science:

• Entomology
• Agricultural Science
• Ecology

Background:

• Grass thrips, Anaphothrips obscurus (Müller), are significant pests in timothy grass (Phleum pratense L.).
• Understanding their population dynamics and phenological variations is crucial for effective pest management.

Purpose of the Study:

• To compare the efficacy of different sampling methods for Anaphothrips obscurus.
• To investigate the occurrence of brachypterous and macropterous thrips across various sampling conditions.
• To reveal insights into the population dynamics and seasonal variations of this thrips species.

Main Methods:

• Three absolute and two relative sampling methods were employed in timothy grass fields.
• Sampling was conducted across different dates within a season and at various times of day.
• Thrips were counted, and different phenotypes (brachypterous and macropterous) were recorded.

Main Results:

• Absolute sampling methods exhibited greater consistency over time of day and seasonal dates compared to relative methods.
• Macropterous individuals of Anaphothrips obscurus increased during spring and summer, indicating aerial dispersal.
• The beat cup method, an absolute technique, proved to be a reliable and efficient sampling approach, faster than direct observation.

Conclusions:

• Sampling method significantly impacts the assessment of thrips population dynamics and phenological structure.
• Temporal patterns (diurnal and seasonal) markedly influence sampled arthropod abundance and adult phenotypes.
• The beat cup method is recommended for its efficiency and reliability in sampling grass thrips.