Posts Tagged: sunflowers
UC Davis Professor Stacey Harmer: Why It's Better for Sunflowers to Face East
Have you ever noticed that sunflowers facing east attract more bees? An 11-member team of...
A honey bee heading toward an east-facing sunflower in Vacaville, Calif. (Photo by Kathy Keatley Garvey)
Catch of the Day
It's early morning and the spider is hungry. It snares a honey bee foraging for pollen and...
An orbweaver snares a honey bee in its sticky web in a patch of Mexican sunflowers, Tithonia rotundifola, in Vacaville, Calif. (Photo by Kathy Keatley Garvey)
Tiny freeloader flies (family Milichiidae) grab their share. (Photo by Kathy Keatley Garvey)
So Bee It...
The honey bees love it. So do the long-horned bees, bumble bees, carpenter bees, European paper...
A honey bee heads toward a Mexican sunflower, Tithonia rotundifolia, in Vacaville, Calif. (Photo by Kathy Keatley Garvey)
Ah, this Mexican sunflower is all mine. (Photo by Kathy Keatley Garvey)
It pays to keep a lookout while you're foraging on the ever-popular Mexican sunflower, genus Tithonia. (Photo by Kathy Keatley Garvey)
California takes the lead on hybrid sunflower seed production
Enjoying a tasty sunflower seed snack? Cooking with sunflower oil? Thank a California sunflower seed grower for producing the hybrid seed that's used for planting sunflower crops throughout the United States and the world, for confectionery and oil seed production.
California farmers grow about 70,000 acres of sunflower, mostly in the Sacramento Valley, for hybrid seed stock.
“We have perfect conditions for growing sunflowers, with hot, dry summers and plenty of good irrigation water for producing high quality seed,” says Rachael Long, UC Cooperative Extension farm advisor in Yolo, Solano and Sacramento counties. “We also have good pollination by honey bees and field isolation from wild sunflowers, needed for high yields and genetic purity of planting seed stock.”
Indeed, take a look at the lovely fields of sunflowers blooming in the summertime. Their striking show of bright yellow faces across the valley's vast agricultural landscapes elicit feelings of warmth and happiness.
“But don't stop there!” says Long. “Take a closer look at the fields and you'll see rows of plants with single large flowers alternating with rows of smaller plants with multiple flowers. Stalks with single flowers are female, smaller ones are male; cross pollination occurs by honey bees to produce the hybrid planting seed, harvested from the single female flowers.”
To assist farmers in producing hybrid sunflower seed crops, Long led a team of researchers to produce a new 2019 sunflower hybrid seed production manual for California. The manual provides information on production needs, such as irrigation and nutrient management, as well as a color guide to insect pests, diseases, and weeds of concern for hybrid sunflower seed production.
“In order to ship seed to worldwide markets, strict field certifications are in place to ensure that pests endemic to California are not spread elsewhere,” Long says. Weeds, insects and diseases growers should watch for are identified in the manual.
“Sunflower Hybrid Seed Production in California” is available for free download at https://anrcatalog.ucanr.edu/Details.aspx?itemNo=8638. In addition to Long, authors of the manual include UC Cooperative Extension farm advisors Sarah Light and Konrad Mathesius, retired USDA plant pathologist Thomas Gulya, UC Cooperative Extension irrigation specialist Khaled Bali, and emeritus UC Cooperative Extension soils specialist Roland Meyer.
“A special thanks to the sunflower seed industry and associate editor Dan Putnam, UC ANR agronomist at UC Davis, for their extensive contributions to this manual to make it a valuable resource for sunflower seed growers,” Long adds. “All of us are also grateful to UC ANR Communication Services for putting together a high quality publication!”
New UC ANR cost study for growing hybrid sunflower seeds helps farmers estimate costs
A new study on the costs and returns of producing hybrid sunflower seed in the Sacramento Valley has been released by the UC Agriculture and Natural Resources' Agricultural Issues Center for farmers who are considering growing hybrid sunflower seeds.
“Although the acreage is relatively small – about 50,000 acres in the Sacramento Valley – hybrid sunflower seed is an important crop because California growers produce the seed for planting stock, destined to be planted in many areas around the world for oilseed and confectionary snack food markets,” said Sarah Light, UC Cooperative Extension agronomy advisor and co-author of the cost study.
Authors Rachael Long, Mariano Galla and Light received input and reviews from fellow UC Cooperative Extension farm advisors and agricultural industry cooperators for the study, which is based on a typical farm in the Sacramento Valley producing field and orchard crops.
“One thing new in our cost study is that it's based on a crop that is irrigated with subsurface drip as opposed to flood,” Long said.
The study estimates the cost of hybrid sunflower seed production on 200 acres as part of a row crop rotation, using subsurface drip irrigation. The subsurface drip irrigation tape is replaced every seven years. Annually, 15 percent, or 30 acres, of the subsurface drip tape is replaced.
To avoid cross-pollination with other sunflower varieties, hybrid sunflower seed production requires at least a 1.25-mile field isolation or different planting times. In this study, male sunflower seed is planted in three rows on a single 5-foot bed and female seed is planted in two rows on three 5-foot beds. The field ratio is 25 percent male parent lines to 75 percent female parent lines. With two hives per acre, honey bees are used to cross-pollinate between the parent lines. The male lines are destroyed after pollination to prevent seed contamination of the female lines.
The authors used current production practices to identify costs for the sunflower crop, including material inputs and cash and non-cash overhead. The study includes tables that show profits over a range of prices and net yields, monthly cash costs, costs and returns per acre, hourly equipment costs, and the whole farm annual equipment, investment and business overhead costs.
The new study, “Sample Costs to Produce Sunflowers for Hybrid Seed in the Sacramento Valley – 2018,” can be downloaded for free from the UC Davis Department of Agricultural and Resource Economics website at http://coststudies.ucdavis.edu.
Sample cost of production studies for many other commodities are also available at the website.
For additional information or an explanation of the calculations used in the studies, contact the Agricultural Issues Center at (530) 752-4651 or UC Cooperative Extension advisors Rachael Long at rflong@ucanr.edu, Sarah Light at selight@ucanr.edu, or Mariano Galla at mfgalla@ucanr.edu.