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Introduced pine sawfly

Introduced pine sawfly

Diprion similis

A species of Diprion, Also known as Imported pine sawfly

The introduced pine sawfly (Diprion similis) is considered a major pest to pine trees since it was accidentally introduced to North America. It has a preference for white pine, which is confusing because there it shares a common name with another insect known as the White pine sawfly. These insects can be identified with their yellow and black abdomen.

General Info About Introduced pine sawfly
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Attributes of Introduced pine sawfly
Colors
Brown
Black
Habitat
pine forest; natural stand; plantation; nursery; estate; mountain; ornamental tree; wind break; roadside; pasture grown tree
Adult Food Sources
Pine needles from eastern white pine, scots pine, red pine, and other pinus species
Larva Food Source
Pine needles from eastern white pine, scots pine, red pine, and other pinus species
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Introduced pine sawfly is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Predatory
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing-lapping mouthparts
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Species Status of Introduced pine sawfly
It is native to central and northern Europe and Asia but has been accidentally introduced into North America where it has become invasive.
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Distribution Area of Introduced pine sawfly
Europe, Asia, North America
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Appearance of Introduced pine sawfly
The adult male is between 7 mm and 9 mm in length, black apart from the underside of the abdomen which is sometimes reddish-brown. Antennae are black and bipectinate (feather-like), and legs are yellow except for the trochanters and the base of the femora which are brownish-black. The female is between 8 mm and 1.02 cm long, with a black head and thorax and usually a yellow and black abdomen, although some individuals are dark. Antennae are black and serrate (saw-like), and legs are yellow with dusky bases. Larvae have black heads and resemble the caterpillars of lepidopterans.
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How to Identify Introduced pine sawfly?

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Life Cycle of Introduced pine sawfly
Egg The eggs of introduced pine sawfly are often laid in clusters or rows on host plants. During this stage, the embryo inside develops and prepares to hatch. The eggs may be oval or cylindrical and exhibit slight color changes as the embryo matures.
Larva Upon hatching, introduced pine sawfly enters the larval stage, characterized by molting and significant growth. They lack developed wings and have a worm-like shape. Consuming vast amounts of food, they are often a different color from adults, which helps in camouflage.
Pupal After the final larval molt, introduced pine sawfly enters the pupal stage. Enclosed in a cocoon or pupal case, the organism undergoes remarkable transformation. Bodily structures are reorganized and wings develop, although introduced pine sawfly remains immobile during this stage.
Adult Emerging from the pupa, the adult introduced pine sawfly's development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, and the adult is mobile, focusing on reproduction and may possess colors for mating rituals.
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Adult Size of Introduced pine sawfly
7 - 10 mm
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Predators of Introduced pine sawfly Larvae
Birds, small mammals, predatory insects, spiders
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Predators of Adult Introduced pine sawfly
Birds, rodents, larger insects, spiders, bats
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Scientific Classification of Introduced pine sawfly
Tips for Finding Introduced pine sawfly
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How Can You Attract Introduced pine sawfly
Since introduced pine sawfly are not typically lured with food, this field is not applicable.
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Habitat Preferences of Introduced pine sawfly Through Different Life Stages
The larvae of introduced pine sawfly are commonly found munching on the needles of various pine species, which is their primary food source. As for the pupal stage, it typically takes place in a silken cocoon attached to foliage or in the litter on the ground beneath the host trees. Adults, however, are most often encountered in areas surrounding the host trees, as they engage in mating and oviposition activities. To search for the larvae, inspect the foliage of pine trees, looking for defoliation or silk webbing. Pupae would require sifting through litter at the base of these trees. For adult introduced pine sawfly, survey the area around pines, especially where there is fresh growth, since they are likely to be found there during reproduction.
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When is the Best Time to Observe Introduced pine sawfly
The suitable time for finding introduced pine sawfly would be during daylight hours as they are more active during this period.
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What is the Best Weather to Observe Introduced pine sawfly
Mild weather conditions without extreme temperatures or heavy rains are more suitable for finding introduced pine sawfly.
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How and Where Can You Find Introduced pine sawfly at Different Life Stages
Larva The larval stage of introduced pine sawfly can be found on host plants. Look for chewed foliage and silken webbing to locate larvae.
Pupal During the pupal stage, introduced pine sawfly may be found attached to leaves or within leaf litter. Search for cocoons by inspecting the bark of trees, leaf surfaces, and surrounding ground cover.
Adult Introduced pine sawfly adults are often found on or near host plants as well. To locate adults, observe flowers, leaves, and branches, especially during mating season when they are most active.
Are Introduced pine sawfly harmful?
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Harmful Effects of Introduced pine sawfly
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Agricultural Pests

Larvae of introduced pine sawfly feed on the leaves of a wide range of host plants, resulting in defoliation that can span from mild to severe. Small infestations typically lead to cosmetic leaf damage. In contrast, severe infestations can defoliate plants entirely, potentially reducing photosynthesis, stunting growth, and in certain cases, leading to plant death. This widespread damage can have substantial economic impacts on agricultural productivity and ecosystems.

More Effects of Introduced pine sawfly

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