When you visit the Bohart Museum of Entomology on the UC Davis campus, you're likely to see...
The Indian domino cockroach is part of the live "petting zoo" at the Bohart Museum of Entomology. (Photo by Kathy Keatley Garvey)
One thing that has many times struck me about farm calls in raspberry, often in tunnels, is the appearance of yellowing starkly on one hand of the leaf in association with stress. Usually the stress comes from the tunnel being too hot, though sometimes the stress is originating from salt. It's never in my experience been associated with nutritional deficiency, with leaf nutritional analyses clearly indicating that the leaf is dying rather than being short mineral nutrition.
Checking with UC Davis scientist Dr. Neelima Sinha about this phenomenon, she suggests that the distribution of cytokinins (and perhaps other hormones), that help maintain the green of the leaf, could be uneven owing to asymmetric leaf development and therefore giving cause to the uneven yellowing of the leaf. She asks if is this handedness always occurs on the same side of the leaf? I haven't thought of it, but looking at the three photos below it does seem like this might be the case.
Any pictures of the opposite side of the raspberry leaf yellowing from what I have here (being the left hand of the leaf when looking at it from the top) from the grower, PCA and researcher community would be very interesting at this juncture.
Yellowing of raspberry leaf on one side deriving from heat stress.
More leaf yellowing on raspberry on one side deriving from heat stress.
Fall dieback on crabapple beginning on one side of the leaf.
JOB TITLE: Pesticide Safety Educator (CES 2/3) JOB ID: 3582 LOCATION: DAVIS CLOSE...
I just discovered that there are 993 blog post on our “Topics in Subtropics” Blog Site posted as UC Ag & Natural Resources. And you can read them all, if you have some down time this season. Citrus and Avocado topics covering water issues are common, but then the odd fire and new pest and new crop article pops up too. I haven't counted them, but that's what the blog counter says. Maybe some of this stuff is still true today. Check it out.
Move over, teddy bears. There's a new bear in town to covet, cuddle and cherish--a water bear or...
Entomologist Eliza Litsey, who received her bachelor's degree in entomology this year from UC Davis, shows some of the water bears (tardigrades) available in the Bohart Museum of Entomology gift shop. (Photo by Kathy Keatley Garvey)
Here's looking at you. Water bears in the Bohart Museum of Entomology are soft and cuddly. (Photo by Kathy Keatley Garvey)
Insect-themed t-shirts are popular in the Bohart Museum of Entomology gift shop, especially during the holiday season. This is entomologist Eliza Litsey. (Photo by Kathy Keatley Garvey)
Senior museum scientist Steve Heydon checks out the insect-themed shirts at the Bohart Museum of Entomology. (Photo by Kathy Keatley Garvey)
Entomologist Jeff Smith (back), who curates the Lepidoptera section at the Bohart Museum, handmade these pens, available in the gift shop. With him is Robert Michael Pyle of Grays River, Wash., founder of the Xerces Society for Invertebrate Conservation. (Photo by Kathy Keatley Garvey)
Children's insect-themed books are great gifts for budding entomologists. (Photo by Kathy Keatley Garvey)
Butterflies, dragonflies and lady beetles (lady bugs) adorn the t-shirts at the Bohart Museum of Entomology. (Photo by Kathy Keatley Garvey)