Ecological Understanding of Insects in Organic Farming Systems: Insect Life Cycles Last Updated: March 31, 2010

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1 Ecological Understanding of Insects in Organic Farming Systems: Insect Life Cycles Last Updated: March 31, 2010 eorganic author: Mary E. Barbercheck, Penn State University How Insects Grow In agricultural systems, it is important to be able to recognize both the adult and immature life stages of insects to be able to make appropriate management decisions. Most insects have three life stages: egg, immature, and adult. Because insects have a rigid body covering, called an exoskeleton, they are not able to increase in size by simply expanding. As the insect grows, the body covering is periodically shed and replaced with a larger one in a process called molting. The stage between molts in immature insects is called an instar. Most insects molt several (4 to 8) times between emergence from the egg stage and when they become adults. Most insects do not molt as adults. The change in form that insects undergo as they develop is called metamorphosis. The life cycles of most insects fall into one of three general types: simple (or gradual) metamorphosis, intermediate metamorphosis, and complete metamorphosis (Gillot, 2005). Simple (or gradual) metamorphosis: The immature insects, usually called nymphs, are similar in appearance to adult, but are wingless. Wings appear as reduced wing buds on nymphs, and are full-sized only in the adult. The nymphs and adults tend to live in the same habitat and feed on the same type of food plant. Common insect groups in which this type of metamorphosis occurs include the grasshoppers and crickets, mantids, true bugs, leafhoppers, and aphids. 1 of 5 7/26/13 9:57 AM

2 Figure 1: Diagram of gradual metamorphosis. Figure credit: Weeden, C.R., A. M. Shelton, and M. P. Hoffman. Biological Control: A Guide to Natural Enemies in North America. /ent/biocontrol/ (http://www.nysaes.cornell.edu/ent/biocontrol/) Accessed February 9, 2009 Intermediate metamorphosis: Some insects undergo metamorphosis that is intermediate between simple and complete. Common insect groups in which this type of metamorphosis occur include whiteflies, scales and thrips. Complete metamorphosis: The immature and adult forms are usually very different in appearance, and often live in different habitats and feed on different food plants. The early immature stages are often wormlike, and are called larvae. Larvae usually have chewing mouthparts. After the last larval stage, the insect transforms into the pupal stage. Pupae are often covered with a cocoon or some other protective structure, for example a chamber in the soil. The final molt occurs at the end of the pupal stage. The final life stage is the adult. Common insect groups in which complete metamorphosis occurs include the lacewings, beetles, flies, butterflies and moths, ants, wasps, and bees. Larvae of moths and butterflies are commonly called caterpillars. Larvae of beetles are often called grubs, and larvae of flies are often called maggots. 2 of 5 7/26/13 9:57 AM

3 Figure 2: Insect life cycle showing complete metamorphosis (a weevil is used as the example). Image Credit: Invasive.org (http://www.invasive.org/weeds/loosestrife/ch2basicinsectbio.html), a joint project of The Bugwood Network (http://www.bugwood.org/). Insect Seasonal Cycles Knowing how many generations per year an insect pest will complete and when damaging stages occur can affect management decisions, for example, waiting to plant until after damaging stages are completed. There is considerable variety among insect species in the amount of time it takes to complete a generation. Most insects in temperate climates complete their full life cycle in one year. However, there are some notable exceptions to this pattern, for example, periodical cicadas, that have life cycles from 13 to 17 years. Many insects complete more than one generation per year, and the number of generations can be stable across geographic range, or vary depending on climate in the geographic range. For example, some species may have multiple generations in the southeastern US, while the same species only completes one or two generations in the northern part of its range. Many insects have a life stage that occurs in the winter. Depending on the species, the overwintering stage can be the egg, an immature stage (nymph, larva, or pupa), or adult. In tropical or arid climates. rather than overwintering, insects may enter a quiescent state or diapause during dry or wet seasons. This article is part of a series discussing the ecology of insects in organic farming systems. For more information, see the following articles: Ecological Understanding of Insects in Organic Farming Systems (/pages/18906 /ecological-understanding-of-insects-in-organic-farming-systems) Decomposers in Organic Farming Systems (/pages/18905/decomposers-in-organic-farmingsystems) Pollinators in Organic Farming Systems (/pages/18926/pollinators-in-organic-farming-systems) Natural Enemies in Organic Farming Systems (/pages/18907/natural-enemies-in-organic- 3 of 5 7/26/13 9:57 AM

4 farming-systems) How Insects Damage Plants (/pages/18903/ecological-understanding-of-insects-in-organicfarming-systems:-how-insects-damage-plants) Plant Defenses Against Insects (/pages/18913/ecological-understanding-of-insects-in-organicfarming-systems:-plant-defenses-against-insects) Insect Life Cycles (/pages/19194/ecological-understanding-of-insects-in-organic-farmingsystems:-insect-life-cycles) Insect Populations (/pages/18912/ecological-understanding-of-insects-in-organic-farmingsystems:-insect-populations) Factors that Influence the Size of Insect Populations (/pages/18569/ecologicalunderstanding-of-insects-in-organic-farming-systems:-factors-that-influence-the-size-of-in) Diversity, Stability, and Productivity of Insect Populations (/pages/18534/ecologicalunderstanding-of-insects-in-organic-farming-systems:-diversity-stability-and-productivity) Ecological Succession (/pages/18911/ecological-understanding-of-insects-in-organic-farmingsystems:-ecological-succession) Insects in Ecological Communities (/pages/18908/ecological-understanding-of-insectsin-organic-farming-systems:-insects-in-communities) Additional Resources for an Ecological Understanding of Insects in Organic Farming Systems References and Citations Gillot, C Entomology. 3rd edition. Springer Science & Business Media. Dordrecht, The Netherlands. Additional Resources Pedigo, L. P., and M. E. Rice Entomology and pest management. 5th ed. Pearson Prentice Hall. Columbus, OH. Wikipedia contributors. Metamorphosis [Online] Wikipedia, The free encyclopedia. Available at: (http://en.wikipedia.org/wiki/metamorphose) (verified 15 March, 2009) This is an eorganic article and was reviewed for compliance with National Organic Program regulations by members of the eorganic community. Always check with your organic certification agency before adopting new practices or using new materials. For more information, refer to eorganic's articles on organic certification. eorganic 3152 Browse related Articles by tag: organic production (http://www.extension.org/category/organic_production), eorganic (http://www.extension.org/category/eorganic) This resource area was created by the: Organic Agriculture (http://www.extension.org/pages/18297/organic-agricultureis-brought-to-you-by-eorganic) community 4 of 5 7/26/13 9:57 AM

5 These resources are brought to you by the Cooperative Extension System and your Local Institution. extension provides objective and research-based information and learning opportunities that help people improve their lives. extension is a critical part of the Cooperative Extension System and an educational partner with 75 land-grant universities in the United States extension. All rights reserved. View this page: 5 of 5 7/26/13 9:57 AM

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