July 25, 2016
How You Can Stop Aphids By Understanding Their Interactions With Plants
Knowing which aphids target which crops and how aphids colonize and move on plants goes a long way toward setting up an effective management plan.
July 7, 2016
Two Industry Veterans Discuss How To Meet The Challenges Of Grower Education
Two industry players have a conversation on how we can deliver the level of grower education needed to address complex issues associated with production practices and pest management strategies.
February 17, 2015
A New Look At Biological Control: Can Plants Affect The Performance Of Natural Enemies?
The success of a biological control program depends on a number of factors including quality of natural enemies, timing of release, release rates and environmental conditions. However, what is typically not taken into consideration is how plants can affect the performance of natural enemies, including attack rate and searching ability. Biological control agents work hard to protect plants, but plants have ways to help themselves, too.
April 29, 2014
Industry Perspective: Systemic Insecticides And Bees: Are We Revisiting “Silent Spring”?
The impact of systemic insecticides on bees and other pollinators is not new phenomenon. Kansas State University Entomology Professor Raymond Cloyd says we, as an industry, need to work together to provide unbiased information that is based in sound science.
January 19, 2011
Pesticide Resistance In Natural Enemies
Pesticide resistance is always a concern because once an arthropod (insect or mite) pest population can no longer be adequately suppressed with existing pesticides, then management options become limited. Resistance is the genetic ability of some individuals in an arthropod pest population to survive an application or multiple applications of a pesticide. In other words, the pesticide no longer effectively kills a sufficient number of individuals in the arthropod pest population. Resistance develops at the population level and is an inherited trait. As such, surviving arthropod pests can pass traits genetically onto their offspring or next generation, enriching the gene pool with resistant genes (alleles). The amount of “selection pressure,” or the frequency of applying pesticides, is the main factor that influences the ability of an arthropod pest population to develop resistance to pesticides. This then increases the proportion or frequency of resistant individuals. However, there are sometimes inquires or […]
May 27, 2009
Taking Out Spider Mites
Two-spotted spider mite, Tetranychus urticae, is still one of the most destructive mite pests of greenhouse-grown crops. Because it is so destructive, greenhouse producers use miticides to alleviate problems and avoid excessive mite outbreaks. Several commercially available miticides are called mitochondria electron transport inhibitors, or METIs, which disrupt the production of energy or adenosine triphosphate (ATP). But before any specifics are addressed, it’s important to note the significance of the mitochondria. The mitochondrion is a membrane-bounded organelle that is associated with intracellular respiration. It is a major site of ATP production and oxygen consumption in cells, and it retains enzymes involved in the citric-acid cycle and in oxidative phosphorylation. Overview Miticides active on mitochondria include acequinocyl (Shuttle), pyridaben (Sanmite) and fenpyroximate (Akari). These miticides either inhibit NADH dehydrogenase (complex I) associated with electron transport, act on the NADH-CoQ reductase or bind to the Qo center or cytochrome bc1 (complex III) […]
June 20, 2008
Fungus Gnat Management
Fungus gnats (Bradysia spp.) are major insect pests of greenhouse crops and can cause economic losses across a wide range of crops during stock plant, propagation and finished plant production. Female fungus gnat adults lay eggs in growing media, and the emerging larvae feed on the roots and crown. Fungus gnat management is an ongoing focus of our research team. The objective of the study reported here was to evaluate the efficacy of different insecticides applied as media drenches. The notable feature of this study was that we tested insecticides at several geographic locations simultaneously. We used poinsettia as a model test crop because it was grown in all the collaborating greenhouses. Research Methods Six-inch poinsettias were grown in eight greenhouse locations that included seven commercial growers in Colorado, Michigan, New Hampshire, New Jersey and the University of New Hampshire (UNH). Ten containers received each insecticide treatment in each location. There […]
June 18, 2008
Impact Of Fungicides On Natural Enemies
Previously, I have written articles on the compatibility of alternative pesticides, primarily insecticides and miticides, with biological control agents or natural enemies such as parasitoids and predators. In general, natural enemies tend to be more susceptible to insecticides and miticides than insect and mite pests. However, fungicides are applied routinely in greenhouses to control both aboveground and belowground fungal pathogens. So how compatible are fungicides with natural enemies? Although fungicides may not be directly or immediately harmful to a specific natural enemy, there may be indirect or sublethal effects, such as delayed development of the prey and natural enemy, delayed adult emergence of the natural enemy or decreased natural enemy survival. There is, in general, less information on the direct (immediate) and indirect (sublethal) effects of fungicides on natural enemies. In fact, both the Koppert and BioBest Side Effects Manual/Guide contain minimal information on the effects of fungicides on many […]
June 12, 2008
All Predatory Mites Are Not Created Equal
Have you ever considered implementing a biological control program in your greenhouse operation? Well, first of all, what is biological control? Biological control involves the release or application of natural enemies including parasitoids (parasitic wasps), predators and pathogens (in this case entomopathogenic fungi and nematodes) into a greenhouse in order to regulate an existing insect or mite pest population. One of the most widely used groups of natural enemies are predatory mites, which are commercially available from most biological control suppliers. There are a number of predatory mite species commercially available that are in the family Phytoseiidae, including Phytoseiulus persimilis, Neoseiulus fallacis, Neoseiulus californicus, Nesoseiulus longipes and Galendromus occidentalis. It is important to understand the behavioral characteristics of predatory mites before implementing a biological control program since behavioral responses to plant volatiles, feeding preferences and dispersal of predatory mites will influence their ability to provide control or regulate different “levels” […]
April 26, 2017
Monitor Potential for Heat Stress in Your Geraniums
Heat stress, which can originate from a lack of air flow around baskets suspended in high areas, causes foliar bleaching and chlorosis of zonal geraniums.
April 25, 2017
Kelly Norris: Diversity is the Key to Growing the Ornam…
Offering a selection of ornamental grasses that cater to customer needs will keep sales from stagnating.
April 25, 2017
Out-Of-This-World Plant Nutrition: Fertilizer Company I…
NASA scientists are growing vegetables on the International Space Station using Florikan’s controlled release fertilizer.
April 25, 2017
41 New Vegetative Petunias From California Spring Trial…
With the abundance of new introductions for the 2018 retail season, we’ve made it easier for you to sift through them by separating out the vegetative petunias from the Northern sites, which includes selections from Westhoff Flowers, Sakata Ornamentals, Danziger, Proven Winners, and Syngenta flowers.
April 24, 2017
Ian Baldwin Offers Examples From Grower-Retailers on Pr…
In March, Baldwin wrote a blog advising grower-retailers to consider raising their prices this spring. The post inspired a number of creative suggestions.
April 22, 2017
American Floral Endowment Announces Winners of 2017 Pau…
Four students pursuing careers in horticulture now have scholarships to help them along the way, thanks to the American Floral Endowment.
April 20, 2017
Terra Nova Nurseries Releases Two New, Attractive Begon…
Stardust is the latest addition to Terra Nova Nurseries’ existing T Rex Begonia series, and Silver is the first introduction to the company’s new Spectre Begonia series.
April 19, 2017
Suppliers Can Offer Technical Solutions for New Cannabi…
Here’s a look at how a few manufacturers have partnered with growers to make their transition into cannabis a smooth one, whether it’s through hands-on guidance or partnering with other industry leaders.
April 18, 2017
Cool Combos From CAST 2017 – Editor’s Choic…
With container gardening becoming more of a lifestyle among consumers than a trend, and breeders continuing to put more effort in container mixes and components, I feel I would be remiss if I didn't share some of the special combinations that not only caught my eye at California Spring Trials, but absolutely took my breath away and made me want to immediately get started gardening.
April 17, 2017
LumiGrow’s Latest Lighting Research Highlighted in Grow…
Industry leaders representing a broad range of vegetable, floriculture, and cannabis producers gathered to learn how to implement modern lighting strategies for their own production.
April 16, 2017
Danziger Invests in Continued North American Business G…
As part of a new business structure for its North American market, Mike Fernandez has been appointed Market Manager North America for Bedding Plants and Perennials, and Kate Zvara was named as Key Account Manager and Retail Specialist.
April 15, 2017
How Oregon Growers Are Making Lean Improvements With He…
The Oregon Nursery Lean Consortium recently helped two Pacific Northwest growers realize significant productivity gains and labor savings.
April 14, 2017
How to Trial a New Product Before You Use It in Your Gr…
Before you apply a new product on a plant, you want to make sure it is safe and effective. Technical experts from Kemin have compiled a five-step guide designed to help you measure the benefits of a new product you want to incorporate into your operation.
April 13, 2017
AmericanHort’s Production Technology Conference To Debu…
The AmericanHort Production Technology Conference is designed to give nursery and greenhouse growers a chance to get hands-on with the latest advancements in production technology and explore the return on investment potential of equipment purchases and upgrades.
April 13, 2017
Research Team Seeking Feedback From Hydroponic Growers
Are you a hydroponic grower of food crops? If so, Michigan State University and Iowa State University researchers are looking for your input.