MBC130718

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JULY 18, 2013

SERVING MANITOBA FARMERS SINCE 1925 | VOL. 71, NO. 29

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$1.75

MANITOBACOOPERATOR.CA

PHOTO: ©THINKSTOCK

Grasshoppers the top pest this growing season MAFRI entomologist urges farmers to scout early because the window for best control is closing rapidly

By Daniel Winters CO-OPERATOR STAFF

T

hey say that on the Prairies, you either get grasshoppers or mosquitoes, but never both. Not this year. In scattered pockets around the province, young hoppers are boiling underneath the grass canopy while pestilential hordes of mosquitoes swarm above. While mosquitoes are out in full force, most hopper infestations were still in the nymph stages and concentrated around the edges of fields as of the middle of last week, said

John Gavloski, an entomologist with Manitoba Agriculture, Food and Rural Initiatives. The good news is that edge spraying is still an option, but the window for effective control with pesticides is rapidly closing, he said. Hot spots include the Dauphin and Ste. Rose area as well as Beausejour, but populations are higher than normal across most of the province. “We’re trying to encourage people to get out and look. If numbers are high, it’s much easier to deal with them when they are juveniles than when they are adults,” said Gavloski, adding that many areas

will reach the adult stage around July 20 to 30. Economic thresholds are “tricky,” and in most cases amount to a “best guess” simply because the hyperactive hoppers won’t sit still long enough for a sure count, he said. Generally, eight to 14 adult grasshoppers per square metre is enough to cause yield losses, while for nymphs, the number is 30 to 35 per square metre. “Kick around the grass, and look at the range, said Gavloski. “Don’t get too caught up whether it was 30 or 32.” Timing is everything, because once they get their wings, they are harder

to kill with chemicals and able to disperse to greener pastures. The delayed spring hasn’t dampened grasshopper populations as much as expected, nor has rain, which only kills newly hatched hoppers, and only if the ground is flooded over for a spell. (Older ones crawl up stems and eggs remain viable even after prolonged periods of being submerged.) Hot, humid weather favours a fungus that kills hoppers, but typically only late in summer after they’ve already caused substantial damage. See HOPPERS on page 6 »

Look to winter hay stocks now With U.S. alfalfa fields recovering from extensive winterkill, Manitoba producers should expect to see hay flow south this fall By Shannon VanRaes

Publication Mail Agreement 40069240

CO-OPERATOR STAFF

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provincial forage specialist is urging cattle and dair y producers who plan to buy hay to lock in their winter supplies early or risk losing out to U.S. buyers again this year. Last year, drought in the American Midwest drew hay south, and a second year of poor production will likely see a repeat this fall, said Glenn Friesen, a forage specialist with

Manitoba Agriculture, Food and Rural Initiatives. “There was quite a bit of winterkill in the major U.S. dairy areas — Michigan, Wisconsin, Iowa, parts of Illinois, Minnesota — it was widespread,” said Friesen. “We’re a little bit concerned that this could draw a lot of alfalfa out of the Prairies, and primarily the eastern Prairies.” Many Canadian forage producers now have a handle on the paperwork and transporSee HAY STOCKS on page 6 »

Glenn Friesen, a forage specialist with Manitoba Agriculture, Food and Rural Initiatives. PHOTO: SHANNON VANRAES


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