Using Ants as Pesticides | Food Production and Preservation | Forums

Interesting, wonder if any native species in NA do the same

A new scientific review from Aarhus University shows that when farmers use ants as pest controllers, it is just as effective as using chemicals. In addition, the method is sustainable – and far cheaper.

As the global population rises and finite resources dwindle, farmers need new, more sustainable ways to control pests. Ecologists have now found a safe, sustainable and cost-effective new pest control. But rather than a high-tech new compound or genetic technology, it’s a tiny, low-tech organism: the ant.

Published 31 August in the British Ecological Society’s Journal of Applied Ecology, a review of more than 70 scientific studies provides evidence that on many crops from cocoa and citrus to palm oil and cedar, ants can control pests as efficiently – and more cheaply – than chemicals.

The review was conducted by Aarhus University’s Dr Joachim Offenberg, an ecologist who has studied ants for almost 20 years. It includes studies of more than 50 pest species on nine crops across eight countries in Africa, South-East Asia and Australia.

Most of the studies in Offenberg’s review are on weaver ants (Oecophylla), a tropical species which lives in trees and weaves ball-shaped nests from leaves. Because weaver ants live in their host trees’ canopy, near the flowers and fruit that need protection from pests, they are good pest controllers in tropical orchards.

All farmers need to do is collect ant nests from the wild, hang them in plastic bags among their tree crops and feed them a sugar solution while they build their new nests. Once a colony is established, farmers then connect the trees that are part of the colony with aerial ‘ant walkways’ made from string or lianas.

After that, the ants need little, except for some water in the dry season (which can be provided by hanging old plastic bottles among the trees), pruning trees that belong to different colonies so that the ants do not fight, and avoiding insecticide sprays.

The review shows that crops such as cashew and mango can be exceptionally well protected from pests by weaver ants.

One three-year study in Australia recorded cashew yields 49% higher in plots patrolled by ants compared with those protected by chemicals. Nut quality was higher too, so net income was 71% higher with ants than with chemicals.

more http://scitech.au.dk.....esticides/