Finally got the shot of twospotted spider mite and Lewis mite close to one another in the same picture for comparison. I've shared this with others, but these two mites tend not to be found together, and rather form colonies on different parts of the leaf.
However, here we go. Photography is mine, it's not great, but hopefully enough to help a bit. More explanation in the caption below the photo.
This one doesn't show too much in strawberry here on the Central Coast, so I was glad when the sample was brought in to me. Complaint was fairly significant numbers of a reddish mite mixed together with a mess of twospotted mite. Are these going to cause a problem was the question. Given that the carmine mites here are few in number and, as per the UC IPM website, tend to decline anyway as the temperatures warm in the spring, my call was to focus on the vast numbers of twospotted spider mite here.
I'm not going to restate the excellent information provided by colleague Shimat Joseph several years on the Salinas Valley Agriculture blog, so here is the link:
March 25, 2021 Addendum:
In terms of control of carmine mite, growers are benefiting from the settlement of a controversy within the world of acarology (the study of mites) that has been brewing since 1867. Thanks to entomologist Dr. Sarah Zukoff at the CalPoly Strawberry Center, I was made aware of a paper recently published in the journal Acarologia comparing point by point the morphology, biology and genetics of these mites and arriving at the clear conclusion that the genus and species of carmine mite are actually the same as twospotted spider mite. That is to say, they are both Tetranychus urticae and carmine mite is simply a non-spotted, "red form" of twospotted spider mite.
Far from being an idle intellectual exercise for an out of touch academic elite, this finding is of real consequence on the farm. Because carmine mites are exactly the same genus and species as twospotted spider mite, the control methods would naturally be identical - the same chemistries and predators would be effective against both of them. This is very good to know should carmine mite, or perhaps better described now, the red form of twospotted spider mite, become a pest of consequence in one's strawberries.
Hat tip again to Dr. Zukoff, who brought this important information to my attention.
Most of you know that birds are a real terror in blueberry, so much that netting is mandatory for blueberry growers across the country. Be it as it may that strawberries sustain a lot less damage from birds than do blueberry, strawberry growers are not exempt from this issue, which we have pictured below.
Our meeting is now open for access. This has been a massive undertaking for presenters, organizers and tech people, but here we are, good to go. As I've stated before, videos are on-demand, so can be viewed at your leisure and when your powers of concentration are at their peak.
Topics have been grouped to facilitate organization. If you are applying for continuing education, you must view the video in question and then answer the quiz questions at the end. Most, if not all of the videos, have quizzes, so all you will find yourself taking them. They are not hard, they are just a part of the meeting design this time around.
Spanish language translations, if not done by the presenters themselves, are provided courtesy of our regular translator Diego Celes of Transagro, are identical material to the English.
https://ispri.ng/KrzNQ - Field Management and Breeding
Pest Management, Laws and Regs, Entomology - Those who wish to view the videos with full navigation capability, and do not need DPR Continuing Education Credit can select the second link marked (No DPR Credit)
https://ispri.ng/KrzlQ - Manejo del Rancho y Fitomejoramiento
A deep bow of appreciation and respect to the education team at the California Strawberry Commission, namely Emily Webster, Joy Jacobs and Jason Sharett who helped immensely in setting all of this up. And of course, a giant thank you to all the presenters, who have adapted wonderfully to the new situation of presenting online and adapted their presentations to fit it.
As always, and I know many of you don't hesitate, please feel free to contact me with your comments and suggestions for improvement.
So this year you don't have to hassle with coming down to my office, partake in less than premium coffee and miss some of your morning work on the farm. The Certified Scout training for LBAM is on youtube this year.
I've spoken with the Agricultural Commissioner's office, and the critical part to document your participation is that you email <firstname.lastname@example.org> or call me 831-763-8025. I'll briefly ask you some questions, get your name down and forward to the Ag Commissioner.
Here is the link (you can also search 2021 LBAM on the site):