Entomologists worried about weather’s impact on bees, stink bugs
by MBJ Staff
Published: March 4,2012
ACROSS MISSISSIPPI — Warm weather in January and early February is causing honey bees to be active before they have enough food to eat, and the state’s beekeepers need to monitor colonies for starvation, a Mississippi State University expert said.
“Contrary to what many people think, bees do not hibernate in winter,” said Audrey Sheridan, research associate in MSU’s Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology. “They remain in the hive, clustered together, until the outside temperatures are above 54 degrees Fahrenheit. They are not reproducing during this time, but they are consuming energy to maintain a constant temperature in their cluster. The honey and pollen they saved from the summer keeps them alive through the winter.”
Warm weather stimulates some plants to bloom and generate pollen, which in turn stimulates the queen to start laying eggs earlier than she normally would, Sheridan said. If there is a freeze, those plants could be killed, and that food source would not be available to the developing bees.
“With an increase in the demand for food, the bees are flying more to forage, and since there is little nectar available, they’re rapidly consuming honey,” she said. “They could easily run out of honey before the spring nectar flow begins.”
Harry Fulton, former state entomologist with the Mississippi Department of Agriculture and Commerce and secretary-treasurer for the Mississippi Beekeepers Association, said henbit and yellow buttercup are in bloom, and maple, elm and cedar trees are blooming early.
Normally the colonies in central and north Mississippi do not gather enough nectar to sustain themselves until mid-March, he said.
“In other words, they are consuming more than they are gathering until that point,” he said. “Combined warm weather and pollen supply is causing bee colonies to be three to four weeks ahead of schedule in spring build-up,” Fulton said. “The disadvantage is that unless beekeepers really stay on top of things and keep track of food stores, colonies could quickly starve to death with all the young bees hatching to be fed, along with all the brood being raised.”
Brood refers to the egg, larva and pupa stages of the bee’s lifecycle, before it emerges from the cell as a young bee. Typically, cold weather prevents the queen from laying a lot of eggs because they cannot be kept warm enough to survive when the colony clusters for warmth. The uncovered areas of brood will die.
“Any sudden cold spell like we had in mid-February could set them back, but since it only lasted two days, the colonies weren’t harmed beyond some brood loss,” he said.
The first sign of starvation bees dragging out partially eaten brood, he said.
“Inspect the hive and any time a colony has two frames or less of stored honey, it should be fed,” he said.
Beekeepers should limit feeding to candy boards or sugar syrup in inboard feeders or hive-top feeders directly above the cluster, Fulton said. Avoid using an entrance feeder unless it is warm enough for bees to be flying. In an emergency, beekeepers should sprinkle dry sugar on top of the frames.
If warm temperatures continue, the spring flow may be earlier, as some nectar-producing plants, especially various types of clover, could bloom ahead of schedule.
This unusual activity may lead some beekeepers to consider splitting their hives early, but they should note that queens or commercially produced queen cells may not be available.
Sheridan, who works for the Extension Service and the Mississippi Agricultural and Forestry Experiment Station, said beekeepers have valid concerns about the weather’s impact on the usual schedule of colony development and the availability of package bees and queens.
“Considering that most queen producers have scheduled their activities months in advance, beekeepers may not be able to get the queens they need this early,” she said.
If hives are strong early, beekeepers should routinely check for swarm cell production and manage their colonies regardless of the weather.
“If crowded, bees could still swarm on days when the weather is suitable for flight,” Fulton said.
Proper management is the key to successful beekeeping, Fulton said.
“With such a warm January and February, it looks like beekeepers in central and north Mississippi are in for a great year if they can keep their colonies fed and healthy until April,” he said. “As for southern Mississippi, the bees should already be making and storing lots of honey from spring titi, a tree with white flowers that normally blooms in February. Their season normally runs about a month ahead of the northern part of the state.”
The National Oceanic and Atmospheric Administration reported the state’s average temperature for January was 50.7 degrees, the 15th warmest January on record.
In a separate item, many Mississippians wonder whether the mild winter will increase the insect pest populations in their gardens and fields this year. However, spring weather could be the more significant factor, said Mississippi State University experts.
MSU Extension Service entomologist Angus Catchot said he is asked about the impact of the winter weather on insect populations everywhere he goes.
“Generally, you can make some assumptions on how cold or mild winters will impact insect pest numbers, but usually it is more about the spring than the winter,” he said. “For example, you can have a really harsh winter that kills most of an overwintering population of insects, but a very favorable spring, where conditions are perfect for wild host plants. Then insect numbers can rebound very rapidly.
“On the other hand, you can have a very mild winter and many more insect pests than usual can survive the winter, followed by a spring with limited host plants. Then numbers can actually be reduced going into summer,” he said.
Catchot said winter survival of parasites or parasitoids that feed on certain insect pests may keep insect populations in check.
“This winter has certainly been a mild one so far, and the early spring is shaping up to have adequate rainfall for abundant wild host plants,” he said. “Most folks guess we’ll see a resurgence in some insect pests that we haven’t seen in high numbers for a couple of years.”
Insects survive seasonal temperature changes in a variety of ways, and growers need to increase their awareness of native and invasive insect populations as winter gives way to spring.
Blake Layton, an entomologist and Extension professor at MSU’s Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, said the state’s native pests are well-adapted to the variable winter temperatures. In contrast, invasive insects use warmer temperatures to establish themselves in the state as they move from subtropical climates.
“Once these insects get a toehold in the Gulf Coast, they can move farther north. The Argentine ant has been seen in north Mississippi,” he said. “They can displace fire ants, and they don’t sting. If they stay outside, they are beneficial. The problem is they like to come inside.”
Layton had a colony of Argentine ants in his yard, but they disappeared during last year’s cold winter. He did not get any calls about them from clients, either.
“A winter like this, though, can allow them to survive. Tropical and subtropical adapted insects will be affected most when we have a warm winter,” he said. “Two years ago, the big concern in row crops was the redbanded stink bug, which had moved from Louisiana into the Delta. The cold winter of 2010 resulted in the disappearance of the redbanded stink bug from Mississippi, since stink bugs are greatly impacted by temperatures.
“Last year was a light year for stink bugs in all crops, but this year’s warm temperatures will improve the survival of stink bugs over the winter,” Layton said.
Stink bugs afflict soybeans, cotton and vegetable crops, such as tomatoes and peas. Early generations are not very abundant, but they have several generations per year.
“When you spray for stink bugs, you may impact beneficial insects that help control caterpillars, so then you have to spray for caterpillars. Everything is interrelated,” he said.
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