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A Pocket Guide Common Natural Enemies - page 2 / 4

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Predacious Hoverflies

1 2 3 4 "

larva

egg

(Diptera: Syrphidae) Identification

puparium

aphids

Adults mimic wasps and bees, but fly more quickly or hover, often have yellow markings; larvae maggotlike; eggs small, whitish, and oblong.

egg Eupeodes fumipennis

Observation tips

Eggs, larvae, and tarlike excrement are found at aphid colonies; adults mostly on or hovering at flowers.

Sphaerophoria P r e d a c i o u s a c t i v i t y S c a e v a p y r a s t r i s u l p h u r i p e s

Larvae prey mostly on aphids and scale insects; adults feed on flower feeders; some species not predacious.

Other insects confused with hoverflies

Bee flies

Bees

Wasps

7

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Parasitoid Tachinid Flies

(Diptera: Tachinidae) Identification

1 3 2 3 "

Eggs on host

Adults similar to houseflies, but with very long bristles on tail end; puparia red to brown and oblong; larvae inside host; eggs white and oblong on host.

Platyprepia guttata

Parasitic activity

Puparia next to hosts

Important endoparasitoids of many worm, beetle, sawfly, and bug pests; populations can increase rapidly.

Observation tips

Adults seen on flowers; look for eggs on host, puparia near host

Flies commonly confused with tachinids

House flies

Blow flies

Flesh flies

8

Ground or “Carabid” Beetles

(Coleoptera: Carabidae)

Identification

Scaphinotus marginatus

Adults are dark or metallic with ridged wing covers; larvae grublike with large mandibles.

larva

Observation tips

1 3 2 "

Adults mostly active at night; look for fast-running adults under objects on soil surface or in soil samples, larvae in soil samples.

Pterostichus scitulus Predacious activity

Prey mostly on soil organisms, some feed on seeds.

Other beetles confused with carabids

Tenebrionid beetles

9

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Rove Beetles

(Coleoptera: Staphylinidae)

Philonthus sordidus

Leptacinus batychrus

1 8 1 3 "

Insects confused with rove beetles

Identification

Adults small with short wing covers not covering abdomen.

E a r w i g s ( a d u l t s > 1 3 )

Predacious activity

Prey mostly on small soil organisms.

Carrion beetles Observation tips

Adults mostly active at night; look for fast-running adults under objects on soil surface or in soil samples.

10

Damsel or “Nabid” Bugs

1 3 1 2 "

nymph

(Hemiptera: Nabidae)

Identification

Adults and nymphs long and thin with front legs slighty enlarged for grabbing prey.

Nabis spp. feeding on Lygus bugs

Observation tips

Most commonly found running on low, dense vegetation.

Predacious activity

Adults and nymphs prey on other insects in same habitat.

Other bugs confused with nabid bugs

Assassin bugs

Some of the thinner mirid bugs

Stilt bugs

11

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Predacious Stink Bugs

(Hemiptera: Pentatomidae)

Perillus bioculatus

Identification

1 3

2 3 "

Adults and nymphs have a broad pentagon or shield shape, usually brown or grey rather than green.

Brochymena sp.

Observation tips

Found on vegetation; may have to observe activity to determine whether the species is Predacious activity Adults and nymphs prey on other insects in same habitat predacious or herbivorous

Similar-looking herbivorous stink bugs

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