As the alfalfa hay harvest season wraps up and we get in gear to attend the November 2017 Western Alfalfa and Forage Symposium in Reno, NV, we're making the presentations and handouts from the 2017 Kearney Alfalfa and Forage Field Day available.
The Alfalfa and Forage Field Day was held this year on September 20, 2017, at the Kearney Agricultural Research and Extension Center (KAREC) in Parlier, CA. Activities during the half-day event included a tram tour of ongoing forage research projects followed by a few hours of classroom style presentations by UC Farm...
- Author: Nicholas Clark
Last year many forage sorghum fields were heavily infested and damaged by Sugarcane Aphid (SCA) (Figure 1) – Melanaphis sacchari – feeding. Most calls came in around early July of 2016 with reports of aphids that were not well controlled using broad spectrum materials such as malathion, chlorpyrifos, or dimethoate. This triggered investigations which confirmed the invasion of the new species of aphid to California.
Based on field research and extension material from the US states in the South and Southwest, some basic guidelines for spotting, scouting, and treating SCA can be outlined for potential best management practices in our CA forage sorghum production system.
PCA's and field scouts, be on the lookout with your hand lenses this late fall for flea beetles in recently emerged small grains that are planted near forage sorghum fields. Check sorghum fields as well for these beetles if there are plants still standing and you expect a small grain crop to come up soon within that field or adjacent to it. Weeds may also be a transitional host for the beetle, so good weed control between crops and along field edges is important. The adult beetles are very small (1-3 mm long), are various in color patterns depending on the species, have enlarged hind leg femurs (upper part of hind leg), actively crawl on sorghum and small grains leaves, and will readily jump like a flea when disturbed. Still, the most...
- Author: Nicholas Clark
Join us at the Kearney Agricultural Research and Extension Center for a half day of demonstrations and education on managing pertinent issues in alfalfa and forage production in the San Joaquin Valley.
DATE: September 14, 2016
TIME: Registration starts at 7:30 AM
Tram tour leaves at 8:00 AM
Meeting ends at 12:30 PM with LUNCH
WHERE: Kearney Agricultural Research and Extension Center
Building 114, Nectarine Room
- Author: Vonny M. Barlow
Basic background and biology of the blue alfalfa aphid:
The blue alfalfa aphid (Acyrthosiphon kondoi Shinji) was first identified by entomologists in the spring of 1975 in the Imperial Valley of California. Since then it has become widespread throughout the state and has become established in Arizona, Nevada, New Mexico, and as far east as Kansas and Oklahoma. Both adults and nymphs feed on photosynthetic fluids from the leaves and stems of the alfalfa plant. Low to moderate populations of blue alfalfa aphid (BAA) may cause little to no visible yellowing of plants. Blue alfalfa aphid feed in the new growth, at the tips and young leaves. After prolonged feeding, leaves will eventually turn yellow,...