Caterpillars
Here's how to recognise and control caterpillars in your garden.
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What are Sawfly Larvae?
Although they are related to wasps, sawflies don't have a sting. There are about 10 species of sawfly in NZ, with one of them (Monophadnus spinolae) being deliberately introduced to control the very invasive Old Man's Beard weed.
Sawflies were named for their saw-like ovipositor (egg-laying spike), which they quite literally use like a saw to cut into plants, to lay eggs.
One introduced species, the Sirex Wood Wasp (Sirex noctilio), has a fascinating trick; they use their 'saw' to inject fungal spores under pine tree bark, while they are laying their eggs. The fungus then pre-digests the wood, so it's nice and soft for their hatched larvae to eat.
Sawfly larvae generally cause more problems to agriculture than in home gardens, with the exception of one main offender: the Pear and Cherry Slug is actually the larvae of a sawfly.
Symptoms
Sawflies can defoliate young saplings and smaller trees of their favoured species. Willow and poplar trees, pine trees that aren't in good condition, plus eucalypts are all targeted by various species of sawflies. Poplar and willow trees in the Otago region may also be targeted by the recently introduced pest, the Hairy Poplar Sawfly (Cladius grandis).
Monophadnus spinolae - The beneficial sawfly that eats Old Man's Beard weed.
Pear & Cherry Slug
If you notice a glossy slug-like grub on the leaves of your apples, pears, plums and quinces, it'll be a pear and cherry slug. Here's how to identify and control them in your garden.
Wasps
Some wasps are beneficial to the environment, but some introduced species are destructive (and irritating) pests. Here's how to tell the difference, so you can safely treat wasps in the garden and outdoor areas.
Millipedes
Millipedes can chew through your plants. Here's how to identify and effectively control them in your garden.
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