WHERE & WHEN
Richvale: Thursday, Jan. 26, 8:30 am, Evangelical Church, 5219 Church St., Richvale
Glenn: Thursday, Jan. 26, 1:30 pm, Glenn County Office of Education, 311 South Villa Avenue, Willows
Colusa: Friday, Jan. 27, 8:30 am, Colusa Casino Resort, 3770 Hwy 45, Colusa
Yuba City: Friday, Jan. 27, 1:30 pm, Veterans Hall, 1425 Veterans Memorial Circle, Yuba City
TIME: Doors open at 8:00 am and meetings start at 8:30 am at Richvale and Colusa. Doors open at 1:00 pm and meetings start at 1:30 pm at Glenn and Yuba City.
8:00 a.m. (1:00 p.m.) Doors open, sign-in, coffee
8:30 a.m. (1:30 p.m.) Call meeting to order - Nominations – Dana Dickey, Rice Research Board
8:35 a.m. (1:35 p.m.) Rice Pesticide and Regulatory Update – County Ag Commissioner
8:50 a.m. (1:50 p.m.) Weedy Rice in California – Whitney Brim-DeForest, UCCE
9:20 a.m. (2:20 p.m.) New Rice Seed Policy for RES Varieties – Kent McKenzie, RES
9:40 a.m. (2:40 p.m.) Arthropod Management Update – Luis Espino, UCCE
10:00 a.m. (3:00 p.m.) Fertility Update – Bruce Linquist, UCCE
10:30 a.m. (3:30 p.m.) Weed Management Update – Kassim Al-Khatib, UCCE
11:00 a.m. (4:00 p.m.) — ADJOURN —
**** 1.5 DPR Credit in the “Other” category and 2 CCA CE credits****
Finally, the armyworm season seems to be over. Moth trapping shows that the numbers are decreasing to the lowest levels of the season. Additionally, most fields are ripening and therefore less susceptible to armyworm injury.
Overall, armyworm infestations were not as severe as last year. At the beginning of the season there were some very early infestations; however, those infestations may have been detected early because growers and PCAs were scouting closely after last year's outbreak. In most cases, the early infestations that were brought to my attention consisted of small worms, which usually go unnoticed until a few weeks later in the season.
In late August, a second infestation peak occurred. However, this infestation was similar to what we see in normal years. Nevertheless, I saw some injury that might have been approaching treatment levels.
The armyworm moth trapping conducted this year started a little later than I wanted. Next year I hope to start trapping in late May or early June so the first armyworm peak can be detected timely. Number of moths trapped remained low until August, when they started to increase and reached a peak in all locations in the Sacramento Valley. The moth peak observed in early to mid August corresponds to the increased injury observed in late August, when eggs laid by those moths reached the 3rd and 4th instars.
- Author: Whitney Brim-DeForest
The 1st Annual Rice Weed Course will take place:
Friday, September 16, 2016
from 8:30AM to 4:15PM (Registration begins at 8:00AM)
Hamilton Road Field (on West Hamilton Rd. between Hwy. 99 & Riceton Hwy.)
and Rice Experiment Station, Biggs, CA
The day will begin with an interactive tour of the Weed Science research plots at Hamilton Road. Participants will also spend time learning about weed identification for important rice weeds both at emergence and at heading. Presentations will cover emerging pests of rice, such as weedy red rice and winged-leaf primrose willow. Attendees will hear about new pesticide registrations and updates to current pesticides, as well as information regarding the new Butte herbicide. This course is also a great opportunity to interact directly with the UCCE and UC Davis Rice Weed Research Team!
For a full agenda and registration go to:
For questions, please contact Whitney Brim-DeForest at 530-822-7515, or by email at email@example.com
Credits for PCA, QAC, QAL, Private Applicator, and CA Certified Crop Adviser are pending.
Our two year stretch of little to no blast might be over. I visited an M-209 field last week that seemed to be infected with blast. The lesions appeared to me like propanil drift burn; however, the yellow halo around the lesions made the PCA suspicious. Paul Sanchez, pathologist at the Rice Experiment Station, collected some leaf samples and was able to confirm it is blast.
According to Paul, changes in environmental conditions may be why the lesions did not look like your typical blast lesions. When conditions are favorable, the fungus' spores germinate and infect the tissue. But if conditions change and become unfavorable for the fungus growth and sporulation, the fungus dies and the tissue then has that burned look instead of the white-gray powdery look.
Some of the lesions did look more like the typical blast lesion.
M-209 is a variety closely related to M-205, a variety considered to be susceptible to blast. Since we have not seen blast in the field since M-209 was released, we do not know what level of susceptibility M-209 has. This might be the year we find out.
At this point, a fungicide treatment is not recommended. However, a treatment near heading may be appropriate considering that the field and area have a history of blast epidemics./table>
This year, armyworm infestations were not as severe as last year. Populations did not reach the very high numbers of 2015, but they were early. Growers and PCAs were scouting diligently, and were able to recognize infestations when the worms were small. This gave growers the upper hand and many were ready to make a treatment decision if necessary. Intrepid was used in some fields successfully.
We are not totally off the hook yet. We usually get a second peak of armyworm activity during the late boot and heading stages. UCCE is monitoring moth populations in several areas of the valley using pheromone traps. The traps were set up in early July, and the trapping numbers will be shared in this blog and the UC Rice On-line website.
So far, moth numbers are low, averaging 2.5 moths/trap/day during the week of July 11. Numbers have decreased since the previous week, when the average was 4.3 moths/trap/day. The location with the highest moth numbers is near Knights Landing, averaging 9.2 moths/trap/day. Previous work done by Larry Godfrey, UC Davis Extension Entomologist, found that peaks of 20-40 moths/trap/day might indicate an armyworm larvae peak 7 to 10 days later.
Number of moths/trap/day captured in armyworm pheromone traps across the Sacramento Valley