VIEWS: 4 PAGES: 53 POSTED ON: 4/9/2011
What do the FSU Seminoles call the elderly? Coach UTexas’s Presidents Mansion Research at UTexas UTexas Dogs UTexas Graduate UTexas Driver UTexas Driver Kids of UTexas Grads UTexas Repairmen Sign at UTexas UTexas Tailgating UTexas Tailgating How to get tickets for a Gator game Are cats too tough for bedbugs? Are Bed bugs too tough for Cats? Cat after bedbug attack! CNN Bed Bug Video Species of Bugs Cimex hemipterus, Tropical bed bug Cimex lectularius, Bed bug Moderately excavated Deeply excavated Bed Bug vs Bat Bug Bat Bug, Cimex pipistrella Bed bug, Cimex lectularius Bed Bug Development • Gradual Metamorphosis • Eggs – ~1 mm long, whitish – Sticky, attached to surfaces – Laid in loose groups, ~200 per female • Nymphs – 5 instars – As small as 1 mm long – Tan almost transparent in color – At least 1 blood meal per instar Adults • Temperature affects life-span – At 37° C, females live an average of 32 days while males live an average of 29 days – At 10° C, females live an average of 425 days while males live an average of 401 days • Females can lay between 200 and 500 eggs in their lifetime (Johnson 1942, Usinger 1966) Bed Bug Life Cycle? Total time = 32-48 days 3-12 min feeding 3-12 min feeding 3rd Instar 2nd Instar 2.08 mg (2.18 ul) 0.96 mg (1.01 ul) (4-5 x body wt) 4th Instar (4-5 x body wt) 4.11 mg (4.32 ul) (4-5 x body wt) 3-12 min feeding 3-12 min feeding Adult Female Adult Male 7.81 mg (8.20 ul) 2.37 mg (2.49 ul) (2 x body wt) (1.5 x body wt) Adult longevity = ~1 month 550 days without a blood meal 1st Instar 3-12 min feeding 3-12 min feeding 0.34 mg (0.36 ul) (3-4 x body wt) Hatch in 7-12 days Laid in batches of 5th Instar Eggs 10-50 eggs 7.09 mg (7.44 ul) 1 mm long (2-6 x body wt) 200-500 eggs total Bed bug nymph feeding!! Engorged! With this Info… • Approximately 750,000 bed bugs, feeding simultaneously will drain an average adult. And we can further infer… Roughly 375K bed bugs can change a person from To this… this… Bed Bug Gut Crop Proventriculus Expandable Midgut Malpighian tubules Bites • Bed bugs prefer to bite by not crawling onto host • Painless, red papules, often in rows • 1st bite requires 10-14 days for immune reaction, later bites react faster Rows of bites Medical Importance of Bed Bug Bites • Sometimes: no reaction • Most commonly: small inflamed pruritic bumps that resolve in 1-2 wk • Allergic reaction: skin reaction resulting in urticaria (hives) evolving into fluid-filled rashes, • Complicated by secondary bacterial infections. • Rarely, asthma occurs and may be accompanied by more extensive urticaria and anaphylaxis • No documentation of disease transmission – >20 pathogens have been found in bed bug guts – No evidence of bed bugs spreading HIV or any other disease Other Potential Hosts • Chickens • Pigeons • Cats • Dogs • Rodents How do we feed them in the lab? ½ of the blood ingested is lost by defecation within 5 hours. Movement • Quick movers – Adults can crawl about 4 ft/minute – Nymphs can crawl about 1 ft/minute 2½ minutes for an adult to make it from a TV stand to the pillow 10 minutes for a nymph Close up of Bed Bug Leg • Adapted for crawling. • Claw used for gripping rough surfaces or for gripping host to insert mouthparts. Tarsi Claw Leg of Cockroach • Adapted for running and climbing. • Claws for traction. • Pads for climbing Pads Tarsi smooth surfaces. Claws Pads Cockroach Bed bug Site for pesticide absorption None here Pads vs. No Pads Can’t climb Easily climbs smooth smooth surfaces. surfaces. Activity of the bed bug How does this insect behavior make Gator fans more susceptible to bed bug bites? VS VS April 3rd, 2006 January 8th, 2007 Indianapolis, IN Glendale, Arizona Primarily Nocturnal Activity Start activity around 7:30 pm Primarily Nocturnal Activity Sharp rise in activity from 8:00 pm to midnight and later. Primarily Nocturnal Activity Peak activity at 4:30 am Primarily Nocturnal Activity Sharp decline in activity after 7:00 am What makes them active? • Hunger – search for host until one is found – Most likely follow CO2 or heat • Cannot detect a host beyond 5 feet. • Attractants are being developed Bed Bug Aggregations • Aggregate (Usinger 1966) • Cracks and crevices (Usinger 1966, Pinto 2007) • Bed bug aggregations are chemically mediated by pheromones (Usinger 1966, Siljander et al. 2007) Pictures courtesy of Rick Cooper, Cooper Pest Solutions Drywall Screw & Bed Bug Aggregation 15 bed bug nymphs in slots of drywall screw Aggregations • Possible Advantages • Possible Disadvantages – Safe harborages (Wertheim et al. 2005) (Lorenzo and Lazzari – Competition 1996) – Natural predators – Mate-finding (Pinto et al. 2007) – Overuse of resources – Resist desiccation – Inbreeding (Benoit et al. 2007) Specific life stage that disperses Bed Bug Dispersal • Disperse on belongings Luggage with (Usinger 1966, Pinto et al. bed bug eggs 2007) • If they are dispersing, they are alone, not aggregated • Why do they disperse from aggregations? Picture courtesy Rick Cooper, Cooper Pest Solutions Mating Behavior • Traumatic insemination- Male’s reproductive organ actually pierces the cuticle of the female’s abdomen and injects sperm through the wound, outside of the reproductive tract (Usinger 1966) Picture from Stutt and Siva-Jothy 2001 Problems caused by Bedbugs • Nuisance • Sleepless nights • Inflamed skin lesions • Stained sheets and mattresses • Psychological stress from infested environment Homeless shelters Bed Bug Places • Apartments, condos, houses • Hotels, motels, restaurants Hospitals • Schools, universities, colleges • Halfway houses • Homeless shelters Busses Movie theaters • Correctional facilities • Hospitals • Nursing homes • Subways, busses, taxis Discarded mattresses • Discarded mattresses & furniture • Movie theaters Nursing homes Bed Bug Places Can cats be huge pests? Punk Cats Is this the best method of control?
Pages to are hidden for
"Bed Bug Biology"Please download to view full document