The scientists found that application of dicamba inhibited or delayed flowering in common boneset (Eupatorium perfoliatum), resulting in significantly reduced visitation by insect species, including honeybees (pollinators) and syrphid flies (natural enemies). The image shows a damaged E. perfoliatum plant that received a rate of 56 grams of dicamba per hectare.

Dicamba drift affects non-target plants and pollinators

Dicamba herbicide drift onto plants growing adjacent to farm fields causes significant delays in flowering, as well as reduced flowering, of those plants, and results in decreased visitation by honey bees, according to researchers at Penn State and the Pennsylvania Association for Sustainable Agriculture.

Images from the newly released PlantVillage photo database show a healthy tomato leaf (upper left) next to leaves showing symptoms of disease.

Smartphones enlisted in the battle versus crop disease

Crop diseases, a major cause of famine, have always been diagnosed by visual inspection, though scientists today also use microscopes and DNA sequencing. But the first line of defense is still the keen eyes of farmers around the world, many of whom do not have access to advanced diagnostics and treatment advice.

Simple mathematical formula models lithium-ion battery aging

UNIVERSITY PARK, Pa. -- Hybrid electric vehicles, cell phones, digital cameras, and the Mars Curiosity rover are just a few of the many devices that use rechargeable lithium-ion batteries. Now a team of Penn State researchers has a simple mathematical formula to predict what factors most influence lithium-ion battery aging.

Moon pyramid view from Sun pyramid at Teotithuacan.

Rise and fall of agrarian states influenced by climate volatility

Climate variability is one of the major forces in the rise and fall of agrarian states in Mexico and Peru, according to a team of researchers looking at both climate and archaeological records.

"We are arguing that the climate information in both areas is good enough to establish that climate is playing some role in the rise and fall of these city states," said Douglas Kennett, professor of environmental archaeology at Penn State. "Now we need to further refine the archaeological data."

Brook trout swimming

For trout fishermen, climate change will mean more driving time, less angling

When trying to explain the potential effects of climate change on plants, fish and wildlife, scientists usually resort to language that fails to convey the impact of warming. Now, a study by Penn State's College of Agricultural Sciences fisheries researchers clearly explains the impact of projected warming waters on wild brook trout in the eastern U.S. for fishermen.

Jet contrails affect surface temperatures

UNIVERSITY PARK, Pa. -- High in the sky where the cirrus ice crystal clouds form, jet contrails draw their crisscross patterns. Now researchers have found that these elevated ice cloud trails can influence temperatures on the ground and affect local climate, according to a team of Penn State geographers.