U.S. Storms Blow Record Number Of Moth Into Ontario

CBC  |  Posted: 05/11/2012 12:30 pm Updated: 05/11/2012 4:38 pm


An unseasonably early tornado season in the U.S. Midwest has blown a potentially big problem to southern Ontario farms.


The number of black cutworm moths is incredibly high in the region. The insects were forced north by the storms.


The moths lay eggs in low-lying weedy patches in and around fields. The eggs hatch, and the larvae eat sprouting field corn crops.


"There's no reason to be worried, but there is every reason to be diligent, right now," said Dale Cowan, an agricultural specialist with AGRIS, a southwestern Ontario agricultural co-op.


According to the Ontario Ministry of Agriculture, Food and Rural Affairs, the young caterpillars cut off young plants near ground level, causing them to wilt and fall over. A single larva may destroy several seedlings. The larvae feed at night.


"What you see the next day is plants toppled over or leaf pieces sitting on the ground," Cowan said.


By then, it's too late to do anything.


The moths can be controlled, but if a farmer isn't paying attention, he or she could lose half their crops.


"It’s quite an economic impact if farmers aren’t looking," Cowan said.


Cowan said farmers were hoping the frost in late April would kill the moths and the larvae, but it didn't.


"We know they are there. We just have to wait for them to develop," Cowan said. "Things are in check right now, but things could change quite quickly."


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  • Io Moth (Automeris io)

    This beautiful silk moth is commonly found in woodlands throughout the northeastern region. It flashes the remarkable eyespots on its hindwings when disturbed or as a defense against potential predators, such as birds.

  • Luna Moth (Actias luna)

    Instantly recognizable, the lovely Luna Moth is a common late spring flier in the eastern woodlands. Like all silk moths it has no mouthparts and has a very short life as an adult. The feathery antennae are used to detect pheromones emitted by female Luna Moths, often over a considerable distance.

  • Hummingbird Clearwing (Hemaris thysbe)

    Not all moths are active at night. The Hummingbird Clearwing is commonly found taking nectar from flowers in meadows during daylight hours. Its name is derived from its habit of hovering in front of the flowers it feeds upon, like a tiny hummingbird. Like all sphinx moths it possesses a long tube-like proboscis that is coiled up when not being used to sup nectar from flowers.

  • Black-blotched Schizura (Schizura leptinoides)

    Most moths are masters of camouflage - after all, their lives depend upon surviving the daylight hours! The Black-blotched Schizura is one member of a small group of Prominent Moths that are effective twig mimics. They roll their wings around their abdomen in a tube-like fashion and rest at an angle, looking just like a snapped off twig. You'd be hard-pushed to notice such a moth in an eastern woodlot!

  • Gypsy Moth (Lymantria dispar)

    Some moths are known pests, and none more so than the Gypsy Moth. Introduced to Boston from Europe in the 1860s, it is now widespread throughout the northeastern region. The larvae are generalists and feed upon a huge variety of plants and trees, sometimes defoliating large tracts of woodland. The males are commonly seen during daylight hours as well as at night and have a distinctive erratic flight style. The males use their large antennae to detect the whitish, virtually flightless females.

  • The Herald (Scoliopteryx libatrix)

    Some moths are almost impossibly beautiful and The Herald is certainly one such creature. It has a distinctive patch of orange scales running through the center of the forewing that resembles the glowing embers of a dying fire. This widespread moth hibernates as an adult, sometimes in caves where large congregations can be found.

  • Pearly Wood-Nymph (Eudryas unio)

    A common woodland species, the Pearly Wood-Nymph is a striking-looking moth. In spite of its flashy appearance it is an effective bird-dropping mimic with its largely white and olive coloration. When disturbed it has bright orange hind wings.

  • Clematis Borer (Alcathoe caudata)

    The spectacular Clematis Borer belongs to a group of mostly diurnal wasp mimic moths called Clearwing Borers. So effective are they at mimicking wasps and hornets that they are mostly overlooked! However, even when one is looking that can be frustratingly elusive. The larvae of many species are pests on orchard trees as they bore and feed inside the branches or roots so specific pheromones have been developed to attract and control such species. Obtaining such pheromone lures offers the best chances of seeing these remarkable moths.

  • Showy Emerald (Dichorda iridaria)

    The Showy Emerald is a typical geometer moth in that it rests with its ample wings pressed flat against a branch or tree trunk. However, it is certainly one of the prettiest that occurs in northeastern woodlands. The whitish lines help to beak up the outline of the moth, offering it some degree of camouflage.

  • Small-eyed Sphinx (Paonias myops)

    With its Halloween colors and unique shape the Small-eyed Sphinx is a very attractive moth. It is a common nocturnal species of eastern woodlands and gardens. Like all sphingids it has a powerful, streamlined shape with long tapered wings. The hindwings of this species extend in front of the leading edge of the forewing when the moth is resting, creating an interesting shape.

  • Melsheimer's Sack-Bearer (Cicinnus melsheimeri)

    Melsheimer's Sack-bearer has a character all of its own. With its pug-like face, speckled salmon body and wings and somewhat corpulent aspect it has few rivals in the charisma department! It is not a common moth and is most often found on sandy soils well populated with oaks, the larval foodplant.

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Filed by Lauren Strapagiel  |