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” […]
February 22, 2017
Emerging Industry Leaders Earn Business Management Cert…
Dr. Charlie Hall, Ellison Chair for International Floriculture at Texas A&M University, recently announced the graduation of the fourth cohort of the elite Executive Academy for Growth & Leadership (EAGL) program for nursery and greenhouse growers.
February 21, 2017
Learn How Drones Could Eventually Replace Bees in Polli…
Researchers in Japan are using the principle of cross-pollination in bees to make a drone that could potentially transport pollen between flowers.
February 21, 2017
Ian Baldwin: 2017 is Off to a Strong Start For Plant Re…
Many garden retailers are telling garden retail consultant Ian Baldwin that sales and the consumer’s attitude toward spending have been very strong the last two months.
February 20, 2017
5 New Varieties Shaking Up the Poinsettia Tradition
With poinsettias trending toward non-traditional colors, growers may find new opportunities to spread sales beyond the winter holidays. Here are five of the newest euphorbia varieties to hit the market that may play a role in redefining the future of the poinsettia market.
February 17, 2017
How to Keep Customers Coming Back With Top-Notch Servic…
A recent article on Forbes.com outlines seven ways organizations can take their customer service from good to great and beyond.
February 17, 2017
Proven Winners Makes Improvements to Its Retailer Certi…
Understanding the challenges of training new and seasonal staff at independent garden centers, Proven Winners says it is working to equip managers with tools to prepare their employees to better handle customers’ questions and boost their confidence in selling plants this season.
February 17, 2017
Industry Veteran Tom Foley Discusses His New Role as Vi…
Foley, a greenhouse industry veteran who was most recently with EuroAmerican Propagators, will be responsible for North American sales of WaterPulse’s patent-pending capillary mats and associated irrigation systems to nurseries and growers.
February 17, 2017
Dan and Jerry’s Greenhouse Buys Iowa-Based DeJong Green…
The acquisition will allow Dan and Jerry’s, a bedding plant grower headquartered in Minnesota, to extend its seasonal product offerings and service a new customer base with local distribution.
February 16, 2017
Pleasant View Launches Updated Website for its Savor Ed…
The site is designed to offer a friendly and informative vehicle that delivers product information in an easy-to-navigate format.
February 15, 2017
Syngenta Introduces Two New Flower Series for 2017
‘Sunfinity’ Sunflower produces multiple branches with numerous flowers that bloom all season long, while ‘Obsession Cascade’ Verbena quickly fills containers with vibrant flower patterns.
February 15, 2017
New Greenhouse Cooling System in Development for Hot-Cl…
Researchers at McGill University in Quebec have developed an alternative evaporative cooling solution for greenhouses in warm climates, and are now seeking commercial partners.
February 14, 2017
Suppliers Comment on Plant Genetics’ Fate After EuroAme…
Since the operation’s bankruptcy filing on January 23, 2017, suppliers associated with EuroAmerican Propagators have updated Greenhouse Grower on what the operation’s bankruptcy means for them – and how it will impact grower customers.