- Author: Tunyalee Martin
- Author: Gene Miyao
- Contributor: Michelle Leinfelder-Miles
- Contributor: Konrad Mathesius
Guest authors Tunyalee Martin, with the UC IPM Program, and Gene Miyao, farm advisor, describe a parasitic plant that has been found in some parts of Yolo County and the Delta. Growers of all annual crops should be on the lookout and contact their local Ag Commissioner if they come across any in their fields.
Help in the fight against invasive species by learning more about California Invasive Species Action Week. Article from Martin and Miyao with additional information below:
- Author: Sarah Light
Soil compaction is often a problem in field crop production and occurs when soil particles are pressed together, reducing available pore space for air and water. About half the soil volume is composed of particles, the other half is soil pores. At field capacity, these pores are roughly filled to equal parts with water and air. Pores are the spaces where roots grow, microbes live, and water and nutrients move through the soil. For this reason, compaction can lead to poor water infiltration, increased water runoff and soil erosion, restricted root growth, reduced nutrient uptake, and ultimately poor plant growth and lower yields. For example, last spring we visited a dry bean field where there was about an acre of beans along a road...
Last year, we saw a number of disorders in sunflower that were mainly related to a heat stress by parental line interaction. Despite extensive testing by the USDA and UC ANR for pathogens in many affected sunflower plants, no causal agents were found. Overall, symptoms were found only on the female lines and were fairly uniform in plants in the heat-stress affected fields, which is another clue that the cause was abiotic or environmental, not due to a disease problem. A disease would be more random and affect both male and female lines (unless one line has resistance to the disease).
One disorder observed was foamy head rot of sunflower, a malady that produces copious white frothy material that exudes from the leaf...
- Author: Konrad Mathesius
Join us on Thursday May 17th for this year's University of California Small Grains - Alfalfa/ Forages Field Day.
The event will take place at the UC Davis Agronomy Field Headquarters on Hutchison Drive.
Registration, parking, and lunch are free.
Morning sessions will focus on recent small grains research, afternoon sessions will cover recent developments in alfalfa and forages.
CCA CEUs Approved: 1.5 for the a.m. sessions; 3 for the p.m. sessions
DPR (PCA/QAL) CEUs Pending: 0.5-0.75 for the a.m. sessions; 1.5 for the p.m. sessions
Please see full agenda for more...
With crops being planted in the field, now is a good time to refresh our knowledge of on-farm diagnostics to try to stay ahead of problems. Diagnosing on farm issues requires us to know what normal, healthy crops look like, and to observe in field clues. Crop health can be impacted by both biotic and abiotic disorders. Biotic disorders are caused by living organisms (fungi, nematodes, bacteria, viruses) while abiotic disorders are caused by non-living organisms. This includes things like herbicide damage, environmental factors (water and heat stress), nutrient deficiencies or toxicities, mechanical damage, and soil salinity issues. Biotic and abiotic disorders are...