Intercropping maize with brachiaria can be a double-edged sword strategy

Area of Science:

• Agricultural Science
• Entomology
• Sustainable Agriculture

Background:

• Intercropping is a sustainable agriculture practice that can enhance resource efficiency and soil health.
• It is often used for pest control through repellency, confusion, and biological control.
• However, intercropping outcomes for pests and natural enemies can vary, sometimes favoring or hindering them.

Purpose of the Study:

• To investigate the temporal abundance of key maize pests and natural enemies under maize-brachiaria intercropping.
• To understand the impact of this specific intercropping system on the maize agroecosystem.

Main Methods:

• Field study comparing intercropped maize with monocropped maize.
• Monitoring of key pest and natural enemy populations over time.
• Assessment of crop damage and yield.

Main Results:

• Intercropping led to increased defoliation by caterpillars.
• Specific pests like Dalbulus maidis were promoted, while others like aphids and Diabrotica speciosa were reduced.
• The abundance of natural enemies generally increased in intercropping systems.
• Maize productivity (fresh weight) was reduced in the intercropping treatment.
• Results showed seasonal variations.

Conclusions:

• The study highlights both positive and negative impacts of maize-brachiaria intercropping on pest dynamics.
• Despite challenges like increased certain pest pressures and reduced yield, the benefits for natural enemy populations and potential soil improvements suggest continued viability.
• Recommendations must consider temporal and species-specific contexts.