corn earworm
According to UI CIS 366 “Timing Corn Earworm Control” summer moths began laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD), approximately August 2. Egg hatch and larvae attack begins about 73 GDD later. The peak egg laying period should be between now and 1650 GDD. If you have fresh silking corn during this period (about the next two weeks) it is important to monitor for corn earworm larvae and treat if necessary.
field burning training
Below is additional information about the Idaho DEQ field burning program.
Idaho Department of Environmental Quality (DEQ) is pleased to announce our current Idaho DEQ Grower Training schedule to Southwestern Idaho Counties, including Ada, Canyon, Gem, Payette, Adams and Washington.
• When: Monday August 11th at 700 am
• Where: University of Idaho Extension, Education Center, 1904 E. Chicago Street, Caldwell, Idaho, 83605
• Course Length: 1 ½ to 2 hours with question and answer period afterwards
• When: Tuesday August 18th at 700 am
• Where: Vendome Event Center, 309 State Street, Weiser, Idaho 83672
• Course Length: 1 ½ to 2 hours with question and answer period afterwards
There are no fees involved with this training, although there are fee requirements for your crop residue burning permit. If you have any questions regarding Crop residue burning, directions to the training or other Grower Training information please call us toll free at 1- 866-224-2456, or try (208) 373-0502 and ask for Jonathan Pettit or contact Michael Miller at (208) 860-1478.
field burning
Attached are files with information about the new field burning procedures. You will want to read these files as the process for field burning has changed since the field burning program moved from ISDA to Idaho DEQ.
Late blight in southern Idaho
Late blight was confirmed today in the Mini-Cassia area. The disease pattern is consistent with a seed-borne source of the pathogen. The field in question had received fungicide applications and lesions could not be found in any adjacent fields. The field is scheduled to be killed today. Based on this fact and the absence of thundershowers, the probability of field to field spread is very low. If growers have been applying fungicides with activity against late blight then additional applications are not needed. Fungicides active against late blight include (but are not limited to) standard protectants (chlorothalonil and EBDC based products), strobilurins, Omega, and Gavel. Endura is not effective against late blight.
This finding underscores the importance of buying clean seed and scouting. Even though the weather has not been favorable for late blight development, the disease can get started inside a potato canopy if inoculum is present.
If you have questions or concerns please contact Jeff Miller at 208-431-4420.
Update on corn earworm
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://pnwpest.org), we are currently at 1136 GDD in the Caldwell area, 1076 GDD in the Nampa area and 1297 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on 8/1, in the Nampa area we will hit 1300 GDD on 8/2, and in the Parma area we hit 1300 GDD on 7/24. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae.