Leaf-cutting ant

The leaf-cutting ant Atta striata belongs to the order Hymenoptera and the family Formicidae. These insects are highly social organisms famous for their complex subterranean architecture and their unique evolutionary adaptation of cultivating specific fungi for nutritional purposes within their nests.

This species is a major pest for various crops, including cereals, legumes, citrus fruits, and eucalyptus plantations. Atta striata causes significant economic losses by stripping leaves from young plants and mature crops, which prevents proper plant growth and leads to substantial yield reductions.

The biology of Atta striata is intrinsically linked to fungus farming. A single colony consists of a queen, drones, and various castes of female workers. Their life cycle undergoes complete metamorphosis. The workers cut vegetation into pieces and carry them underground to process them as substrate for the fungus gardens that sustain the entire colony population.

The damage caused by these ants is characterized by rapid defoliation. A massive colony can strip an entire tree or patch of crops in a single night. This continuous foliage removal puts crops under severe stress, reducing their capacity for photosynthesis and making them susceptible to secondary pathogens and climate-related damage.

Management strategies for this pest require targeting the colony structure:

• Utilizing baiting systems with systemic insecticides that workers naturally transport into the deep nest chambers.
• Application of specialized dusts or liquid fumigants directly into active nest vents to eliminate the queen and fungus gardens.
• Implementing mechanical and chemical buffer zones around vulnerable agricultural land.
• Regular field scouting to identify and treat nest mounds before the colony reaches a large scale.