Despite a cooler and wetter spring, B.C. might not be in line for excessive mosquitoes this summer, according to an expert.
Rain water does contribute to ideal breeding conditions, said Dan Peach, an entomologist completing a post-doctoral fellowship at UBC, but there are other factors in play when it comes to mosquito population and it remains to be seen if there will be a boom.
鈥淚t鈥檚 an interesting trade-off 鈥� the more water and more moisture means more habitat for mosquitoes,鈥� said Peach. 鈥淭here are mosquitoes that use temporary water habitats, and so they won鈥檛 dry out as quickly. But the flip side of that is because of how cool it鈥檚 been, it takes longer for mosquitoes to develop and for those species, which have multiple generations a year, this will hamper their ability to build up their population numbers, so it depends on exactly how those trade-offs will really interact going forward.鈥�
Peach was out collecting specimens two weeks ago that he said he would normally come across in late winter or early spring.
With Environment Canada鈥檚 special weather statement forecasting warmer and sunnier weather in the coming days, that might also affect mosquito numbers.
鈥淟ast year, they plummeted towards the end of the summer there,鈥� said Peach. 鈥淒uring the heat dome, it really knocked them down. Heat and dryness will kill adult mosquitoes quite well. They desiccate 鈥� they dry out and die. It also dries up breeding habitat for them so they can鈥檛 reproduce as well.鈥�
A hot, wet summer would likely lead to elevated numbers, the entomologist said.
In terms of mitigating risk of being bitten, Peach recommends disposing of standing water that can accumulate on tarps and in buckets, as that is premium habitat for breeding. A press release from pest control company Orkin Canada recommends trimming vegetation, circulating water in pools, fountains and ponds and using yellow bulbs outdoors, as they are less attractive to mosquitoes.
Peach said wearing light-coloured clothing also helps as female mosquitoes, which are the ones that draw blood, 鈥減refer dark coloration,鈥� and wearing insect repellent or natural alternatives can also be effective.
鈥淟emongrass and citronella are great, rosemary too,鈥� said Peach. 鈥淵ou kind of want a bunch of those things.鈥�
He also pointed out the insects also get a bad rap and have ecological benefit. They鈥檙e pollinators and a food source, with bats, spiders, fish, birds, frogs, dragonflies and their larvae and predaceous diving beetles among the species feeding on mosquitoes or their larvae.
鈥淟arval mosquitoes are filter feeders and in some ways, they鈥檙e helping to convert solar energy from the sun into biomass,鈥� said Peach. 鈥淪o the larvae will eat algae, and decomposing organic matter and they鈥檒l convert that into insect biomass 鈥� and either something eats them or they die somewhere and decompose. In either case, that鈥檚 helping to transfer nutrients from solar energy into biomass. So you think of the sheer number of mosquitoes in some environments, and there might be a lot at play there.鈥�
Peach seeks assistance for his research. He asks people put 鈥渟quished鈥� mosquitoes on a piece of paper, include date of collection and address, cross-street or coordinates from Google Maps, and mail to Ben Matthews Lab, UBC Department of Zoology, 4200-6270 University Blvd., Vancouver, B.C., V6T 1Z4.
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