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Natural insect control without pesticides

Date:
April 20, 2016
Source:
Entomological Society of America
Summary:
Natural control, also known as autonomous control, may offer an alternative to chemical insecticides if conditions are right, new research suggests.
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This is a prickly pear plantation in Axapusco, Estado de Mexico, Mexico.
Credit: J.A. Cruz-Rodríguez

Scale insects known as cochineals are major pests of prickly pear in Mexico, and pesticides are often used to control them. However, one prickly pear farmer has been controlling them without the use of insecticides since the year 2000.

The farmer tipped off a team of scientists from the Universidad Autónoma Chapingo, and he told them that other insects were feeding on the scale insects. The researchers decided to investigate, and they found that the farmer was right. During the entirety of the research, the abundance of scale insects never reached pest status. Furthermore, when populations of scale insects increased, populations of predators increased at the same time, therefore regulating the growth of the scale insect populations. Their observations are described in an article in Environmental Entomology.

The farmer originally thought that ants were controlling the cochineals, but it turned out to be other insects. Six known predators of cochineals were found on the plantation, including different species of beetles, moths, lacewings, and flies -- but no ants.

This study suggests that natural control, also known as autonomous control, may offer an alternative to chemical insecticides.

However, Dr. J. A. Cruz-Rodríguez, one of the co-authors, warns that this method of control isn't necessarily one that can be applied at will to other plantations or crops.

"Autonomous biological pest control cannot be considered a technology that is applied or not depending on the level of the pest," he said. "It is a process that is established and maintained if the agroecosystem retains structural complexity and diversity of species."

In other words, a lot of conditions must be met in order for autonomous control to be viable.

"Autonomous control requires an ecological infrastructure that supports a network of interactions that limit the explosive growth of herbivores," Cruz-Rodríguez said. "Intercropping, agroforestry systems, non-use of biocidal products (or its more rational application) -- they all contribute to the formation of the biotic network that prevents the development of pests."

This study shows that if the conditions are right, farmers can potentially use natural predators for autonomous control.


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Materials provided by Entomological Society of America. Note: Content may be edited for style and length.


Journal Reference:

  1. J. A. Cruz-Rodríguez, E. González-Machorro, A. A. Villegas González, M. L. Rodríguez Ramírez, F. Mejía Lara. Autonomous Biological Control ofDactylopius opuntiae(Hemiptera: Dactyliiopidae) in a Prickly Pear Plantation With Ecological Management. Environmental Entomology, 2016; nvw023 DOI: 10.1093/ee/nvw023

Cite This Page:

Entomological Society of America. "Natural insect control without pesticides." ScienceDaily. ScienceDaily, 20 April 2016. <www.sciencedaily.com/releases/2016/04/160420111235.htm>.
Entomological Society of America. (2016, April 20). Natural insect control without pesticides. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2016/04/160420111235.htm
Entomological Society of America. "Natural insect control without pesticides." ScienceDaily. www.sciencedaily.com/releases/2016/04/160420111235.htm (accessed May 26, 2017).

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