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Garden Pests 

In any garden, pests can pose a significant threat to the health and vitality of plants. Recognizing the most prevalent garden pests and acquiring knowledge of effective management strategies are crucial steps in ensuring a flourishing garden. By understanding these pests and their role in the  environment its possible to implement appropriate control measures to safeguard plants and cultivate a thriving garden environment.

Garden pests - Aphids
Garden friend ladybird


These are tiny, soft-bodied insects that suck sap from plants, causing wilting, distortion, and yellowing of leaves.

Their lifecycle typically involves several stages: egg, nymph, and adult.

  1. Egg Stage: Aphids overwinter as eggs on perennial plants or as tiny eggs laid on plant stems or buds in the spring. These eggs hatch when conditions become favourable, usually in early spring, leading to the emergence of nymphs.

  2. Nymph Stage: Once hatched, aphids go through several nymphal instars, during which they resemble smaller versions of the adult aphids. Nymphs feed on plant sap using their piercing-sucking mouthparts and undergo molting as they grow.

  3. Adult Stage: After completing several molts, nymphs develop into wingless or winged adult aphids, depending on environmental conditions and the aphid species. Winged aphids are produced when populations become overcrowded or food sources become scarce, allowing them to disperse to new plants and locations.

This lifecycle is often repeated multiple times throughout the growing season, with aphids reproducing rapidly under favourable conditions. Additionally, certain aphid species also have a sexual reproductive phase later in the season, leading to the production of eggs that overwinter and restart the lifecycle in the following spring. 

They are known to have a wide range of preferred host plants, and their preferences can vary depending on the species of aphid. ​They are adaptable pests and can infest a diverse array of plants, making them a challenge for gardeners and agricultural producers alike.

Several species of ants have a special symbiotic relationship with aphids, farming them for the honeydew they produce, and in return the ants protects the aphids from predators such as ladybirds.

Slug Eggs

Slugs and Snails

They are notorious for feeding on a wide range of garden plants, leaving behind ragged holes and slime trails. Controlling slugs and snails in the garden can be achieved through various strategies.


Handpicking is an effective method where they can be manually removed, especially during dusk or dawn when they are most active. Barriers such as copper tape or diatomaceous earth can be placed around vulnerable plants to create a barrier that slugs and snails are reluctant to cross. Introducing natural predators like ducks and frogs into the garden can also help control slug and snail populations, as they feed on these pests, contributing to a more balanced ecosystem and reduced pest pressure. Integrating a combination of these methods can effectively manage slug and snail populations while minimizing damage to garden plants.

These pests lay their eggs in moist, hidden areas, including the undersides of pots and trays and also inside plant pots so it is wise to check them regularly. 

Tussock Moth Caterpillar


The larval stage of butterflies and moths, can defoliate plants and cause significant damage.  Biological controls offer environmentally friendly solutions for managing caterpillar infestations in the garden.


One effective biological control is Bacillus thuringiensis (Bt), a naturally occurring soil bacterium that produces toxins harmful to certain caterpillar species. When sprayed on plants, Bt specifically targets and kills caterpillars while being harmless to other beneficial insects, pets, and humans. This targeted approach minimizes the impact on the broader ecosystem while effectively reducing caterpillar populations.

In addition to biological controls, implementing cultural practices like crop rotation can help manage caterpillar infestations over the long term. By rotating crops annually, gardeners disrupt the lifecycle of caterpillars and reduce their access to preferred host plants. This practice prevents the build up of caterpillar populations in specific areas of the garden, reducing the likelihood of infestations and minimizing the need for chemical interventions.

By integrating biological controls like Bt with cultural practices such as crop rotation, gardeners can effectively manage caterpillar infestations while promoting a healthier and more sustainable garden ecosystem. These methods offer natural and proactive approaches to pest management, ensuring the long-term health and productivity of garden plants.


These are small, flying insects that feed on plant sap and excrete honeydew, leading to sooty mould growth and weakened plants. Controlling whiteflies in the garden can be achieved through various methods.


Reflective mulches, such as aluminum foil or silver plastic, disrupt the whiteflies' ability to locate host plants by reflecting sunlight and confusing their navigation. Sticky traps placed near infested plants attract adult whiteflies, effectively reducing their populations.


Introducing natural enemies like parasitic wasps, such as Encarsia formosa or Eretmocerus eremicus, provides biological control by parasitizing whitefly nymphs and reducing their numbers.


Implementing a combination of these methods can help manage whitefly infestations while minimizing the need for chemical pesticides and promoting a more balanced ecosystem in the garden.


Tiny, slender insects that pierce plant tissue and suck out cell contents, causing stippling, distortion, and silvering of leaves.


Releasing beneficial insects like minute pirate bugs (Orius spp.) can help control thrip populations by preying on both nymphs and adults. These predatory bugs are natural enemies of thrips, contributing to biological control without the need for chemical pesticides.


Additionally, using reflective mulches, such as aluminum foil or silver plastic, disrupts thrips' ability to locate host plants by reflecting sunlight and confusing their navigation, thereby reducing their populations.


By integrating these IPM strategies, gardeners can effectively manage thrips while promoting a healthier and more balanced garden ecosystem.


 They can cause considerable damage, eating everything in their path so it is vital to implement various strategies to deter them from entering the garden and causing damage. Securing garden storage areas and compost bins to prevent access to food sources can discourage mice from frequenting the garden. Additionally, removing debris, such as leaf litter and fallen fruit, which can provide hiding places and food for mice, helps reduce their attraction to the garden. Using physical barriers like wire mesh or hardware cloth around garden beds and pots can also prevent mice from accessing plants and causing damage. Finally, employing natural deterrents like peppermint oil or predator urine around the garden perimeter may help deter mice by creating an inhospitable environment. By combining these preventive measures, gardeners can effectively minimize the risk of mice becoming a garden pest.


They can wreak havoc in gardens by browsing on foliage, flowers, and tender shoots. They are particularly partial to roses, geraniums  and Alchemilla Mollis here in the New Forest.  So one approach is to choose deer-resistant plants that are less appealing to deer due to their scent, taste, or texture. Installing physical barriers like fences or netting around the garden can also effectively prevent deer from accessing plants. Additionally, using repellents such as scent deterrents or motion-activated sprinklers can discourage deer by creating an unpleasant or startling experience when they approach the garden. By combining these methods, gardeners can protect their plants from deer damage and maintain a thriving garden landscape.


They are notorious for raiding gardens, digging up bulbs, and nibbling on fruits and vegetables. Using deterrents like noise or motion devices, such as ultrasonic repellents or motion-activated sprinklers, can startle squirrels and discourage them from entering the garden. Planting sacrificial crops, like sunflowers or corn, can divert squirrels' attention away from valuable garden plants, providing an alternative food source. Additionally, protecting vulnerable plants with wire mesh or cloches can physically prevent squirrels from accessing and damaging them. By implementing these deterrent strategies, gardeners can effectively manage squirrel populations and protect their garden plants from harm.


They can cause extensive damage to garden plants by nibbling on foliage, stems, and bark. Creating rabbit-resistant barriers around the garden, such as installing fences with a mesh size too small for rabbits to squeeze through, can effectively prevent them from accessing plants. Additionally, using repellents like blood meal or hot pepper spray can deter rabbits with their strong scent or taste, making plants less appealing. Implementing habitat modification techniques, such as removing dense vegetation or brush piles near the garden, can discourage rabbits from nesting or seeking shelter nearby, reducing their presence in the garden. By combining these strategies, gardeners can protect their plants from rabbit damage and maintain a thriving garden.

By understanding the behaviours and vulnerabilities of your most active garden pests and implementing a combination of cultural, mechanical, biological, and chemical control methods, gardeners can effectively manage pest populations and protect their plants from damage. With careful observation and proactive pest management strategies, maintaining a healthy and vibrant garden is achievable.

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