Understanding Intruders: What is Considered a Pest?

Pest Control
Written by: Charles Robinson
October 5, 2023
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“What is considered a pest?” This question might seem straightforward, but the answer can be tricky. Every creature, whether it’s a bug, bird, or rodent, plays a role in our ecosystem. They all have a purpose and contribute in some way to the balance of nature. But sometimes, these same creatures can become troublesome for us, especially when they interfere with our daily lives, homes, or farming. When they cross that line, we often label them as ‘pests.’ 

However, defining that line isn’t always simple. Just because an insect is in your house, does it make it a pest? Or is it only if they cause harm? As we dive deeper into this topic, we’ll explore what makes an organism a pest and how humans interact with and manage these so-called “unwanted guests.”

Types of Pests

While many organisms co-exist harmoniously with humans, some become problematic due to their destructive habits, rapid reproduction, or potential harm to human health. These unwelcome guests, or pests, can range from the tiniest insects to larger vertebrates. But what types of pests exist, and why do they earn this title?

  • Insects: Arguably, the most common type of pests that come to mind are insects. Their small size often allows them to infiltrate homes and spaces unnoticed.
  • Termites: These insects are notorious for their destructive habits. Feeding primarily on wood, termites can weaken structures, leading to extensive property damage. Moreover, their colonies can grow rapidly, making them especially challenging to manage.
  • Mosquitoes: Not only are they a nuisance due to their itchy bites, but mosquitoes also pose significant health risks as they can transmit diseases like malaria, dengue, and Zika virus.
  • Weeds: Beyond insects, plants can be pests too. Weeds, unwanted plants that grow in gardens and farms, can rob crops of essential nutrients, sunlight, and space.
  • Dandelions: While some admire their resilience and even use them in cooking, dandelions can quickly overrun lawns and gardens if not kept in check.
  • Bindweed: This plant wraps itself around others, suffocating them and taking over patches of land.
  • Rats: Known to be carriers of various diseases, rats can infest homes, contaminate food, and even cause electrical fires by gnawing on wires.
  • Pigeons: While many city dwellers are used to these birds, pigeons can be pests due to their droppings, which can damage buildings and even pose health risks.

Biological Control

Biological control is an eco-friendly strategy that emphasizes the management of pests by introducing or encouraging their natural enemies. This can include predators, parasites, pathogens, or competitors. Rather than resorting to synthetic chemicals, this method aims to harness nature’s own mechanisms of keeping pest populations in check.

Advantages of Biological Control

Environmentally Friendly

One of the most significant benefits of biological control is its reduced impact on the environment. By decreasing the reliance on chemical pesticides, there’s a marked reduction in environmental pollution. This helps in preserving the quality of soil, water, and air.

Cost-Effective in the Long Run

Although the initial investment might seem high, biological control often proves to be cost-effective in the long term. Once natural predators are established in an environment, they continue to control the pest population without the recurring costs associated with chemical treatments.

Target Specificity

Biological control agents usually have a specific target, ensuring that non-pest organisms remain largely unaffected. This is especially important in maintaining biodiversity, as chemical pesticides can often harm beneficial insects or other non-target species.

Disadvantages of Biological Control

Slow to Show Results

Unlike chemical treatments that can show immediate results, biological control methods often take time to establish and produce noticeable effects. This can sometimes make them seem less effective, especially in the initial stages.

Potential for Unintended Consequences

Introducing a new species to control pests can sometimes backfire. These introduced species might become invasive, leading to new ecological problems. There’s also the risk that they might prey on other beneficial species or disrupt local ecosystems in unintended ways.

Not a One-Size-Fits-All Solution

While biological control can be effective for specific pests in certain conditions, it may not be the answer for every pest problem. Environmental factors, existing biodiversity, and the specific characteristics of the pest in question can all influence the success of a biological control strategy.

Agricultural Pests and Human Activities

The relationship between human activities and the rise of agricultural pests is closely intertwined. As humans have cleared vast tracts of land for farming and urbanization, many natural habitats have been disrupted. This shift in landscape, combined with certain farming practices, has led to a surge in pest populations in many areas.

Impact of Human Activity on Agricultural Pests

As humans expand their footprint on the earth, they inadvertently modify ecosystems in ways that can favor certain pests. Deforestation can eliminate natural predators, while monoculture farming—growing just one type of crop over a vast area—offers pests a consistent food source. Over-irrigation and poor drainage can create ideal breeding grounds for many pests, especially insects that breed in standing water.

Common Agricultural Pests


  • Known for forming massive swarms.
  • Can consume vast amounts of crops quickly.
  • Particularly threatening due to their mobility and large numbers.


  • Small insects, but can gather in large numbers.
  • Feed on plant sap, weakening plants over time.
  • Can act as vectors, transmitting plant diseases.

Aggressive Weeds (e.g., Water Hyacinth):

  • Rapid growth and reproduction rates.
  • Can outcompete native plant species, reducing biodiversity.
  • Known to obstruct waterways, impacting irrigation and local aquatic life.

Management Strategies for Agricultural Pests

Addressing the challenge of agricultural pests requires a multi-faceted approach. It’s crucial for farmers to be knowledgeable about the life cycles of pests, their breeding habits, and what conditions make them thrive. This way, they can adopt practices that disrupt these cycles and reduce pest populations.

Integrated Pest Management (IPM)

IPM is a holistic approach that doesn’t rely on just one method of pest control. Instead, it combines various techniques, aiming for long-term prevention while causing the least harm to the environment. IPM might involve introducing natural predators, using pheromone traps to disrupt pest mating, or rotating crops to disrupt the feeding cycle of pests.

Mechanical Control Methods

Mechanical methods can be both simple and effective. Hand-picking can be useful for larger pests or when infestations are small. Traps, like sticky traps for flying insects or pheromone traps for specific pests, can reduce populations without chemicals. Barriers, such as row covers or netting, can keep pests off crops entirely.

Chemical Control Methods

While often effective, chemical pesticides should be used judiciously. Over-reliance can lead to pests developing resistance. Furthermore, many pesticides don’t discriminate between pests and beneficial insects, leading to a decrease in pollinators like bees. There’s also the risk of groundwater contamination and health concerns for both farmworkers and consumers. Hence, they should be used as part of a broader strategy and always follow safety guidelines.

Domestic Animals and Animal Health

Domesticated animals play a pivotal role in many households and farms. From providing companionship to being a source of livelihood, their importance is undeniable. However, they can also be gateways for pests to enter our lives.

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Domestic Animals as Potential Sources of Pest Infestation

Pets (Dogs and Cats)

  • Fleas: These pests are tiny, jumping insects that feed on the blood of mammals, leading to itching and potential allergies.
  • Ticks: Parasitic arachnids that attach to the skin of animals and feed on blood. They can transmit diseases.
  • Outdoor Exposure: Playing or roaming in gardens or parks might expose pets to these pests.
  • Animal Interactions: Meeting other infested animals can lead to a transfer of pests.

Livestock (e.g., Cows, Chickens, Goats)

  • Lice and Mites: Tiny parasites that feed on the skin, blood, or feathers of hosts.
  • Flies: Attracted to waste products and can be vectors of diseases.
  • Waste Management: Poor handling of animal waste can increase the pest population.
  • Proximity: Keeping animals in close quarters can facilitate the spread of pests.


  • Bird Mites: Tiny parasites that feed on the blood of birds and can also bite humans.
  • Droppings: Bird poop not only stains structures but can attract a variety of pests.
  • Feeding Habits: Leftover food or seeds can attract other pests.

Controlling Domestic Animal-Related Infestations

Regular Health Check-ups

Regular check-ups provide a chance for professionals to spot signs of infestation early on. Based on the animal’s health, vets can offer specific preventive measures.


Vaccines help protect animals from diseases, some of which can be spread by pests. They also help boost immunity and ensures that animals have a reduced risk of contracting illnesses.

Preventive Treatments

Apply topical solutions directly to the animal’s skin to repel or kill pests. You should also regularly clean animal habitats can eliminate breeding grounds for pests.

Hygiene and Grooming

Brushing regularly helps in spotting pests early and can also remove them. At the same time, baths using pest-control shampoos can eliminate current infestations and prevent future ones. You should also clean their habitats by regularly sanitizing birdcages, kennels, and barns. 

Safe Interactions

Monitor where pets play to reduce exposure to high-risk areas. Additionally, new animals should be isolated and checked for pests before integrating.

Natural Predators

Ladybugs, spiders, and certain beetles can help control pest populations. Species like swallows feed on flying insects, reducing their numbers around barns and stables.

The Final Word on What is Considered a Pest

Understanding “what is considered a pest” is the first step towards effective management and control. By recognizing these intruders and their impacts, humans can better co-exist with nature, ensuring a balance between our needs and the health of our environment. Moreover, proactive prevention and knowledge-driven interventions are key. This empowers individuals to address pest issues responsibly, safeguarding both our homes and the planet.