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“Aster Yellows”—–very unusual, but not necessarily good

8 Sep

Alien Plant Take Over Your Flowers? No—It’s “Aster Yellow”

See the original post here.

Posies in a panic: tufted leaves that erupt amid a flower head tells you a deadly killer is at work. Read on ....


Virtual Nursery Field Trip

21 Jul

FREE to public institutions with horticulture-related programs (just email—–Virtual nursery field trips to improve instruction in nursery production and other horticulture related topics.

Only qualified educational groups qualify and one free copy per institution. Funding was provided by a USDA Higher Education Challenge grant.

29+GB; 400+ video clips; 40+ nurseries; 20+ states; arranged by topics; available in a 32-GB USB…

Click on the “Topic Index” to check out what’s included!

Poster presented at 2013 NACTA

Know your plants

8 Jul

Had I not known it as “Heliopsis Sunstruck“, I’d say ‘that’s so chlorotic. you may need some heavy feeding of N or Fe’.

Heliopsis Sunstruck: New for 2014, blooms earlier than other Heliopsis and variegated leaves add appeal.

14 Jun

Pythium Efficacy Summary from IR-4

At the IR-4 Ornamental Horticulture Program Workshop in 2009, Pythium Efficacy was selected as a high priority project to expand the knowledge and list of fungicides available to growers for these diseases. In addition to research collected through the IR-4 program, this summary includes a review of experiments conducted from 1999 to 2013 on ornamental horticulture and vegetable crops. During this time period, numerous products representing 38 active ingredients were tested as drench, foliar or soil applications against several Pythium species causing root rot and damping-off on ornamentals, and root rot, cottony leak, damping-off and cavity spot on vegetables. Pythium species tested included: P. aphanidermatum, P. irregulare, P. mamillatum, P. dissotocum, P. myriotylum, P. ultimum and P. vipa. Most trials were conducted on P. aphanidermatum and P. ultimum. Although there were insufficient data for definitive conclusions, several relatively new products that are included in the Pythium efficacy project looked promising. These were Adorn, Disarm, Fenstop, Heritage and Pageant. V-10208 also looked promising. The phosphorus acids/phosphorus acid generators (Agri-Fos, Alude, K-Phite, Magellan, Phostrol or Vital) provided mix results. Acibenzolar, BW240 and CG100 were generally ineffective. The established standards Subdue Maxx and Terrazole/Truban generally performed well. Conversely, the registered biological products Companion/QRD 713, PlantShield/RootShield and SoilGard generally looked ineffective. The data from these trials suggest that the effectiveness of some fungicides in controlling Pythium root rot may vary, depending on the species of Pythium or crop.

Are Biocontrols Compatible With Insecticides And Fungicides?

11 Jun

From Greenhouse Growers:

As an article from the Ontario Ministry of Food And Agriculture states, “The Holy Grail for an IPM Manager: a pesticide that controls all pests and is completely compatible with all biocontrol agents (BCAs). Obviously, it’s not going to happen.”

Some products can be used with biocontrols and some can’t. Biocontrol suppliers have shared the following links to help you make the right choices for using traditional controls in conjunction with biocontrols.

Syngenta’s Integrated Crop Guide
To learn about how Syngenta products can be used along with biological control agents, download this free integrated crop management guide.

Koppert Side Effects Guide
Detailed information about the compatibility of pesticides with most beneficials and the persistence of a possible harmful effect.

BioWorks NemaShield Compatibility Chart

BioWorks RootShield Compatibility Chart

BioWorks CEASE Compatibility Chart

Becker Underwood Compatibility Chart
For the company’s beneficial nematode products

Biobest Side Effects Manual
The Biobest side effects manual incorporates results from the Biobest Green Lab’s extensive compatibility studies, as well as published data and new legislative regulations. This list is based on all crop protection products available on the market.

Biobest Side Effects App For iPhone

Biobest Side Effects App For Android


Susceptibility of commercial cultivars to boxwood blight

20 Feb

From NCSU:

Susceptibility to box blight (Cylindrocladium buxicola = Cylindrocladium pseudonaviculatum) was evaluated for twenty three varieties of boxwood (Buxus spp.) at the Mountain Horticultural Crops Research and Extension Center in Mills River, NC during summer 2012. Disease assessments were performed based on a modified Horsfall-Barratt scale including percent leaf area diseased and percent stem streaking. The results shown below are based on the final disease assessment.

Our results indicate a wide range in susceptibility of Buxus spp. to the boxwood blight pathogen; however B. sempervirens types were more susceptible in general (a 2011 publication reported ‘Justin Brouwers’ to actually fall within the B. sempervirens cluster). The varieties listed as tolerant had minimal lesion development caused by C. buxicola. It is important to note that some boxwood varieties are limited in their optimal plant hardiness zones; make sure to look up specific growing requirements for each variety before recommending them in your area.

Boxblight susceptibility


(click on the picture for better view)

Pediatricians back organics

31 Oct

“Organic Foods: Health and Environmental Advantages and Disadvantages “. Pediatrics 2012;130:e1406–e1415

The US market for organic foods has grown from $3.5 billion in 1996 to $28.6 billion in 2010, according to the Organic Trade Association. Organic
products are now sold in specialty stores and conventional supermarkets. Organic products contain numerous marketing claims and terms, only some of which are standardized and regulated. In terms of health advantages, organic diets have been convincingly demonstrated to expose consumers to fewer pesticides associated with human disease. Organic farming has been demonstrated to have less environmental impact than conventional approaches. However, current evidence does not support any meaningful nutritional benefits or deficits from eating organic compared with conventionally grown
foods, and there are no well-powered human studies that directly demonstrate health benefits or disease protection as a result of consuming an organic diet. Studies also have not demonstrated any detrimental or disease-promoting effects from an organic diet.

Although organic foods regularly command a significant price premium, well-designed farming studies demonstrate that costs can be competitive and yields comparable to those of conventional farming techniques. Pediatricians should incorporate this evidence when discussing the health and environmental impact of organic foods and organic farming while continuing to encourage all patients and their families to attain optimal nutrition and dietary variety consistent with the US Department of Agriculture’s MyPlate recommendations. This clinical report reviews the health and environmental issues related to organic food production and consumption. It defines the term “organic,” reviews organic food-labeling standards, describes organic and conventional farming practices, and explores the cost and environmental implications of organic production techniques. It examines the evidence available on nutritional quality and production contaminants in conventionally produced and organic foods. Finally, this report provides guidance for pediatricians to assist them in advising their patients regarding organic and conventionally produced food choices. Pediatrics 2012;130:e1406–e1415