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There are several general approaches to insect pest management. When developing an overall pest management strategy it is helpful to consider all of the available options. Most specific insect control methods can be classified into the following major categories: cultural control, host resistance, physical control, mechanical control, biological control, and chemical control. Not all are appropriate or useful in the home garden.

Cultural Insect Control

These methods involve modification of standard farming or gardening practices to avoid pests or to make the environment less favorable for them. There are several types of cultural controls; the following are a few examples of commonly used methods.

Crop rotation replaces a crop that is susceptible to a serious pest with another crop that is not susceptible, on a rotating basis. For example, corn rootworm larvae can be starved out by following corn with one to two years of a non-host crop such as soybeans, alfalfa, oats, or other crops.

Crop rotation works best in larger areas where the insects can not readily move from the old crop location to the new, therefore, this technique has limited applicability to garden insect pests.  Sanitation refers to keeping the area clean of plants or materials that may harbor pests.

Examples include removal of weeds in greenhouses that may harbor mites, aphids, or whiteflies; destruction of crop residues such as corn stubble, squash vines, or fallen apples that may be overwintering sites for pests; cleaning of equipment that can spread pests from one area to another.

Trap cropping is the provision of a pest insect’s preferred food near the crop to be protected; the insects are attracted to the trap crop which is then destroyed. For example, pickleworms will concentrate in squash planted near cucumbers, and the squash plants can be destroyed. A carefully considered time of planting will help avoid some pest problems such as seed corn maggot.

Host Resistance

Host resistance, or plant resistance, has been used effectively for decades to reduce the impact of pests. Some plants have physical and chemical adaptations that allow them to repel, tolerate, or even kill pests.

Plant breeders attempt to use these characteristics and even improve them to develop crops that are resistant. Many varieties of important crops grown today, such as wheat, rice, alfalfa, corn, and apples are resistant to one or more pests. Historically, the development of resistant varieties was often tedious and lengthy, requiring many generations of plant hybridization.

Although such traditional techniques will continue, it is likely that modern methods of biotechnology will also provide pest-resistant crops.

Physical insect Controls

These are methods that physically keep insect pests from reaching their hosts. Barriers include window screens for keeping health and nuisance pests out of buildings and plant pests out of greenhouses, floating row covers for many horticultural crops, and plant collars to keep cutworms from attacking plants such as tomatoes.

Various types of traps can be used for monitoring and/or control, such as glueboard traps in homes or red sphere traps for apple maggots. Codling moth larvae can be trapped under cardboard bands wrapped around apple trees; the bands are removed and destroyed.

Some pests, such as earwigs and slugs, can be lured to their death in sunken traps filled with beer. In some cases, chemical lures (containing pheromones or other chemical attractants) are available to increase trap effectiveness. Trapping must be evaluated for each pest situation. In some cases, traps can lead to increased damage, such as pheromone-baited traps for Japanese beetles.

Mechanical Insect Control

Mechanical control methods directly remove or kill pests. They can be rapid and effective, and many are well suited for small acute pest problems, and are popular with gardeners and homeowners. Importantly, mechanical controls have relatively little impact on the beneficial natural enemies of pests and other non-target organisms, and are therefore well suited for use with biological control in an integrated pest management approach (see below).

Hand-picking can be used for large or brightly colored foliage feeders such as Colorado potato beetle, Mexican bean beetle, and tomato hornworm. Some insects will defensively drop from plants if disturbed, and can be knocked into a container of soapy water.

Shaking plants will dislodge many pests. For example, plum curculio beetles can be removed from fruit trees by diligently banging tree limbs with a padded stick and collecting the adult weevils on a white sheet as they fall out of the trees.

A strong spray of water will dislodge aphids and mites from greenhouse, garden, and house plants. Fly swatters and mouse traps are forms of mechanical control. Cultivation or tillage exposes many soil insects to desiccation or predation by birds.

Biological insect Control

This is the use of beneficial organisms to control pests. Many centuries ago, Chinese farmers observed that ants were helping to control insect pests in their citrus orchards by feeding on caterpillars, beetles, and leaf-feeding bugs.

The farmers discovered that by collecting the papery nests of a specific type of ant from trees in the countryside and moving them into their orchards, they got better control of some pests. They also provided aerial bamboo runways among the citrus trees to help the ants move easily from tree to tree.

These efforts to increase the numbers of ants in the orchard and to heighten their efficiency as predators is the first recorded occurrence of biological control of insects, which is the intentional manipulation of populations of living beneficial organisms, called natural enemies, in order to reduce the numbers of pests or amount of damage.

Insects, like other animals, are subject to attack by disease organisms. Microbial control is a form of biological control that uses insect pathogens to control pests. Insect pathogens include viruses, bacteria, fungi, nematodes, and other microorganisms that cause insect diseases.

Disease epidemics among insects are not commonly encountered in nature except when insect populations are very large or when environmental conditions favor the growth of the disease organism. Nevertheless, insect pathogens are very important in the constant suppression of pest populations.

Also, certain insect pathogens have been very successfully manipulated to achieve biological control of specific pests. For example, different strains of the bacterium Bacillus thuringiensis, commonly known as “Bt”, are marketed to control many insects including various caterpillars such as cabbage loopers and gypsy moth larvae, mosquitoes, and Colorado potato beetles.

Many insect pathogens attack only one species or a limited group of insects and therefore are unlikely to harm non-target species such as beneficial insects, humans, livestock, wildlife, or plants.

There are three broad approaches to biological control. Importation of natural enemies is conducted by federal and state agencies to find better beneficial natural enemies and permanently establish them into new areas.

Conservation of natural enemies improves the effectiveness of natural enemies through farming and gardening practices that provide necessary resources for their survival and protect them from toxins and other adverse conditions. Augmentation of natural enemies temporarily increases the numbers of natural enemies through periodic releases, thereby increasing the overall numbers of natural enemies and improving biological control.

Chemical insect Control

This involves the use of chemicals to kill pests or to inhibit their feeding, mating, or other essential behaviors. The chemicals used in chemical control can be natural products, synthesized mimics of natural products, or completely synthetic materials.
Repellants, confusants, and irritants are not usually toxic to insects, but interfere with their normal behavior and thereby keep the insects from causing damage. Mothballs and mosquito repellants are familiar examples. Widescale use of synthetic sex pheromones may confuse insects sufficiently that they are unable to mate and produce offspring – using insect pheromones in this manner is called mating disruption.

This is one method the WDNR has used to slow the spread of gypsy moth in Wisconsin, dropping pheromone flakes from airplanes in order to treat large acreages. A few such products are commercially available for other insects, such as for codling moth control in apples.

This practice works best in large commercial plantings where it is less likely that mated females will move into the planting from outside of the treated area. Many of these types of behavioral chemicals break down or wash away quickly, and must be reapplied frequently, used in an enclosed area, or formulated to release slowly over a long period.
Insecticides and miticides include many types of commercially available toxins, some naturally-derived, others synthesized, that are used for killing insects and mites.

Chemical controls, particularly synthetic organic insecticides, have been developed for nearly every insect pest. They are widely used in industrialized nations for several reasons: they are highly effective – one product often controls several different pests; there is relatively low cost for product or labor; and generally their effects are predictable and reliable. Chemical insecticides have allowed management of larger acreages by fewer individuals because of the reduced labor needed for physical and mechanical controls.

Besides their use in agriculture, chemical insecticides have been very important in the battle against disease-carrying insects, such as mosquitoes that carry malaria.

However, chemical controls have many disadvantages: most have biological activity against many forms of life and therefore can affect non-target organisms; for the same reason, they present various levels of hazard to humans, especially pesticide applicators and other farm workers; most are highly toxic to beneficial insects, such as pollinators and predatory and parasitic natural enemies; both target and non-target insects can develop resistance to insecticides, sometimes very rapidly.

Over-reliance on chemicals and diminished use of other control methods have helped push agriculture away from a more natural, balanced state.

Integrated Pest Management

IPM is the blending of all effective, economical, and environmentally-sound pest control methods into a single but flexible approach to managing pests.

Those who practice IPM realize that it is neither possible nor economically feasible to eliminate all pests; instead pest populations should be managed below economically damaging levels. Users of the IPM approach recognize and understand the importance of the controls provided by nature.

When human intervention is necessary, the least invasive practices, such as plant resistance, biological control, and cultural control, should be used because these are the practices that fit best into sustainable agriculture. Highly disruptive or environmentally damaging practices should be used only as a last resort.

Chemical pesticides should be used only when necessary, based upon frequent and routine monitoring of pest populations. Natural enemy populations should also be monitored so that their impact on pests can be determined. When pesticides are necessary, if possible, only those products should be used that are not detrimental to natural enemies.

Integrated pest management is a dynamic and evolving practice. Specific management strategies will vary from crop to crop, location to location, and year to year, based upon changes in pest populations and their natural controls.

As specific new approaches are developed, these too can be incorporated into the program as appropriate. Modern pest managers will be most effective if they are knowledgeable about their pests, beneficial insects, and all of the control options available.

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