Roll over these common places in Placer County and see which bugs are where, why they’re there and what, if anything, we can do about them

Mosquitoes

Anopheles freeborni, the Western malaria mosquito

Treehole Mosquitoes -
Aedes sierrensis

honey
bees

ticks

dragonfly

In-Ground Yellowjackets

Where are they found?

Mosquitoes lay eggs in a wide variety of standing water sources, including buckets, wheelbarrows, outside toys, kiddie pools, neglected swimming pools, storm drains, household containers, and discarded tires.

Why are they here?

Mosquitoes need water to develop! The first three stages of the mosquito life cycle are spent in the water. they can lay approximately 100-400 eggs which float on the surface of the water.

Within 2-3 days the eggs hatch into larvae.

What can we do?

You can prevent mosquitoes from developing by removing or draining standing water that support this life cycle.

In warm temperatures, mosquitoes can fully develop in as little as three days!

Where are they found?

ANOPHELES FREEBORNI PREFER STANDING WATER THAT IS OPEN AND SUNLIT WITH LOTS OF VEGETATION.

THESE AREAS INCLUDE RICE FIELDS, PONDS, SWAMPY AREAS, CREEK AND STREAM EDGES, AND DRAINS.

Why are they here?

THESE MOSQUITOES HIBERNATE DURING COLD WINTER MONTHS.

IN THE FALL, THEY DISPERSE SEVERAL MILES FROM THEIR BREEDING AREAS TO SEEK SHELTER IN PROTECTED PLACES, SUCH AS ATTICS AND OUTBUILDINGS. THEY ARE OFTEN A NUISANCE AT THIS TIME.

What can we do?

DURING WARMER DAYS IN JANUARY OR FEBRUARY, THEY ARE EXTREMELY HUNGRY AND ARE LOOKING FOR A BLOOD MEAL FOR THEIR DEVELOPING EGGS. BITING FEMALES ARE MOST PESKY DURING AFTERNOONS AND EVENINGS.

ON WARM, SUNNY DAYS, ONLY SCREENED WINDOWS AND DOORS SHOULD BE OPENED. KEEP SCREENS AND DOORS IN GOOD WORKING CONDITION, WITHOUT HOLES AND CLOSING TIGHTLY.

Where are they found?

THESE MOSQUITOES CAN BE FOUND ANYWHERE IN PLACER COUNTY WHERE AVERAGE TEMPERATURES ARE HIGHER THAN 50 DEGREES.

WARMER WEATHER AND LONGER DAYS IN THE PLACER COUNTY FOOTHILLS TRIGGER THE EMERGENCE OF WESTERN TREEHOLE MOSQUITOES, A COMMON PEST AND THE MOST IMPORTANT VECTOR OF CANINE (DOG) HEARTWORM.

Why are they here?

WATER COLLECTS IN TREEHOLES FROM RAIN OR WATERING.

MOSQUITOES ONLY NEED A FEW INCHES OF WATER TO LAY EGGS, SO THE HOLES CAN BE SMALLER THAN YOU’D THINK. FEMALE MOSQUITOES CAN LAY 200 TO 300 EGGS IN THE TREEHOLE JUST ABOVE THE WATER LINE.

What can we do?

FIND A WAY TO DRAIN THE HOLES, OR FILL THEM TREE TAR OR AN ABSORBENT MATERIAL. YOU CAN TALK TO AN ARBORIST FOR THE BEST ADVICE ON HOW TO FILL TREEHOLES.

YOU CAN ALSO CONTACT THE DISTRICT FOR HELP INSPECTING YOUR AREA AND IDENTIFYING PROBLEMS.

Where are they found?

Honey bees can do great in natural or man-made places, but they prefer to live in gardens, woodlands, orchards, meadows and other areas where flowering plants are everywhere. They build nests inside tree cavities and under edges of objects to hide themselves from predators.

Why are they here?

HONEY BEES BUILD NESTS WHERE FLOWERS ARE ABUNDANT. BEES NEED NECTAR AND FLOWERS NEED BEES’ HELP WITH POLLINATION.

WITHOUT POLLINATION, MANY PLANTS WOULD NOT BE ABLE TO REPRODUCE AND EVENTUALLY WOULD DIE OUT.

What can we do?

BEES BENEFIT PLACER COUNTY IN MANY WAYS, BUT IT CAN BE DANGEROUS TO LET A BEE HIVE THRIVE TOO CLOSE TO YOUR HOME, ESPECIALLY IF YOU ARE NOT TOO FAMILIAR WITH BEES.

IT IS IMPORTANT TO PROPERLY IDENTIFY THE PARTICULAR SPECIES LIVING NEAR YOUR HOME, AS BEES ARE OFTEN MISTAKEN FOR WASPS BECAUSE OF THEIR SIMILAR PHYSICAL CHARACTERISTICS.

Where are they found?

Ticks can be found most commonly in grassy, brushy, or wooded areas, especially along sides of trails. Ticks do not fly, jump, or fall out of trees!

Why are they here?

TICKS WAIT ON THE TIPS OF VEGETATION FOR PEOPLE OR OTHER ANIMALS TO PASS BY AND BRUSH UP AGAINST THE TALL GRASS AND BUSHES. WHEN A TICK GRASPS A PASSING HOST, IT WILL THEN CRAWL IN SEARCH OF A SUITABLE LOCATION TO ATTACH TO THE SKIN.

What can we do?

WEAR LIGHT-COLORED PANTS TUCKED INTO YOUR SOCKS WHEN HIKING, WALKING, OR WORKING IN TICK AREAS. REPELLENTS CONTAINING 25% DEET WILL REPEL TICKS AS WELL AS MOSQUITOES.

AFTER COMING BACK FROM TICK HABITATS, SHOWER OR BATHE RIGHT AWAY. CHECK YOUR ENTIRE BODY FOR TICKS FOR SEVERAL DAYS AFTER YOU HAVE BEEN IN TICK HABITAT.

Where are they found?

DRAGONFLIES LIVE IN FRESH WATER. THEY LIKE SMALL STREAMS AND PONDS, BUT CAN BE FOUND IN SHALLOW FRESHWATER HABITATS. ADULT DRAGONFLIES OFTEN STAY NEAR WATER, BUT CAN TRAVEL FAR WHILE HUNTING. THEY ARE FAST FLIERS, SO THEY CAN HUNT IN OPEN AREAS, NOT IN THICK TREES OR OTHER VEGETATION

Why are they here?

DRAGONFLY NYMPHS HATCH FROM EGGS IN FRESH WATER, AND SPEND AT LEAST A FEW MONTHS AS AQUATIC PREDATORS. ONCE THEY ARE BIG ENOUGH, THEY CRAWL OUT OF THE WATER AS WINGED ADULTS.

DRAGONFLIES EMERGE FROM THE WATER IN THE WARM MONTHS OF SPRING OR SUMMER.

What can we do?

Do not harm or try to catch dragonflies when you see them.

Adult dragonflies eat other flying insects, especially mosquitoes and other flies, but also aphids, and just about any other insects they can grab.

Where are they found?

Yellowjackets can be found anywhere in Placer County, building nests in rural, suburban and urban settings.

if you see lots of flying insects emerging from a hole in the ground, they're probably yellowjackets.

Why are they here?

Yellowjackets prefer habitats such as forest edges, meadows, grasslands, farms and city areas. They search for warm places to live, such as in leaf litter, underground or in old logs.

What can we do?

WHEN EATING OUTDOORS, COVER FOOD AND DRINKS TO DISCOURAGE YELLOWJACKETS.

KEEP GARBAGE CANS CLOSED WITH TIGHT-FITTING LIDS, RINSE BOTTLES AND CANS BEFORE PLACING IN COVERED BINS.

AVOID THE AREA AND DO NOT DISTURB THE NEST. CALL PLACER MOSQUITO AND VECTOR CONTROL DISTRICT AND REPORT THE PROBLEM