Category: insects (Page 42 of 88)

Bug of the Week: Damselfly

The timing of natural events, or “phenology,” is something worth noting.

damselfly-augustTake the pond damselfly in this photograph. These delicate, light-brown damselflies arrive each year in our yard in August and September.

damselfly-bestWe found them in August 2012 and

damselfly-wings-up-again in the September of 2011.

It is likely the adult emergence coincides with the summer rains we usually get in July and August. The humidity rises, plants start to grow again, and more insects of many kinds are active.

Interestingly, the brown damselflies we see each year are probably females because the males are often bright blue or violet.

What insects do you see at the same time year after year?

Bug of the Week: Smoke Tree Sharpshooter Revisited

Have you ever encountered a sharpshooter?

really-clear-sharpshooterI’m talking about the group of plant-feeding leafhoppers that have oddly-shaped heads.

eally-close-sharpshooter-undersideYou can tell it is a sharpshooter by the prominent eyes and enlarged, swollen area of the head capsule known as the clypeus. It is yellow with faint stripes in this insect.

sharpshooter-croppedThat swollen area is full of muscles that help the sharpshooter pump fluids from the plant. You could compare it to the bulb of a turkey baster.

The sharpshooter uses its big eyes, too. When something approaches a sharpshooter, it quickly scoots to the other side of the twig or branch. If the potential predator comes even closer, it will leap away with its jumping hind legs.

This is probably a male smoke tree sharpshooter (Homalodisca lacerta) because it lacks the white, waxy patches on the sides of its wings that are found on females (image at BugGuide).

Life cycle:

leafhopper-eggsFemale sharpshooters lay their eggs in rows, generally on the undersides of leaves.

sharpshooter-nymph-goodThe eggs hatch into youngsters called nymphs. They don’t have the bright coloration of the adults, although they do still have a protruding head and noticeable eyes. The nymphs undergo several molts and then become adults.

sharpshooter-nymph-psdYou can often see adults and nymphs feeding together on the same stem.

Unlike some insects, smoke tree sharpshooters are polyphagus, which means they will feed on a number of different plants. The sharpshooter in the top photos is feeding on hollyhock. The single nymph is on Texas yellow bells.

Do sharpshooters occur where you live? Have you ever seen one? What do they feed on where you live?

Bug of the Week: Tarantula Hawk Wasps

Would you believe a wasp may be important to the survival of certain butterflies?

taratula-hawk-wasp-head-view

Tarantula hawks are large, colorful wasps in the genus Pepsis. They are found throughout the southwestern United States.

tarantula-hawk-wasp-2014

The tarantula hawk has a special relationship with the desert or rush milkweed plant (Asclepias subulata). Its slender legs fit into special grooves in the flower while it is drinking nectar. The grooves contain bundles of pollen called pollinia. The pollinia catch on the wasp’s legs.

Tarantula-polliniaSee the pollinia on this wasp’s front leg? When the wasp flies to another milkweed plant, the pollen is transferred and the plant is pollinated.

If a milkweed is successfully pollinated, then it produces seeds, which means more milkweed plants. Milkweed is a larval food source of monarch and queen butterfly larvae.

So, in addition to being fascinating creatures in their own right, these tarantula hawk wasps are helping the monarch and queen butterfly survive.

Do you have any milkweeds growing in your yard? What insects do you see visiting?

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