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Top 5 -yesterday
- New bankruptcy of greenhouse horticulture company still surrounded by question marks
- Rijk Zwaan launches ToBRFV-resistant tomato varieties
- "The fact that you cannot turn on production of food in an instant has come as news to some"
- Additional blue light does not affect taste and crop quality when growing basil
- NASA funds scale-up of fluorescent greenhouse roofing technology
Top 5 -last week
- “Significantly better results with new Iron fertilizers”
- What is the status of tomato brown rugose fruit virus in Europe?
- Race to emission-free greenhouse cultivation pushes growers to keep innovating
- BASF’s vegetable seeds and IUNU partner to advance digital phenotyping for hydroponic lettuce
- Infarm to make strategy shift, cuts 500 jobs
Top 5 -last month
- UK growers stop planting and put nurseries on sale amidst energy crisis and labor shortage
- "You can't grow on water without lights"
- "High-tech farmer AppHarvest is running out of money"
- German family company switches from tomato cultivation to hydroponic lettuce
- Mobile aeroponic system requires less maintenance and guarantees even irrigation
Predatory insect may help with whitefly control
Bemisia tabaci, also known as the sweetpotato whitefly or silverleaf whitefly, attacks a range of plants, including sweetpotato, squash, tomato and poinsettia. The biotype B species has been established in the United States since the late 1980s. It transmits Tomato yellow leaf curl virus. Young tomato plants infected with tomato yellow leaf curl virus are stunted and unproductive.
University of Florida scientist Hugh Smith used a $28,417 IPM Enhancement Grant to observe the feeding habits of the whitefly predator Dicyphus hesperus to see how effective it would be at controlling whitefly in the greenhouse. He also evaluated its activity in conjunction with biopesticides commonly used on whitefly in greenhouse tomato.
Dicyphus hesperus. Photo credit: Hugh Smith
Greenhouse tomato growers often try to grow as sustainably as possible to compete in a crowded tomato market. Avoiding synthetic insecticides often gives their crop an edge over field-grown tomatoes, so many growers turn first to biological control. In addition, producers of greenhouse tomato in Florida rely on hives of commercial pollinators that can be harmed by many insecticides.
Unlike most commercially-available biological control agents, which avoid tomato because of the sticky substance on the leaves, Dicyphus hesperus is adapted to sticky plants. D. hesperus is a predatory true bug that feeds on both eggs and larvae of several pest species, including whitefly, spider mites and caterpillars.
Because D. hesperus is used primarily in Canada and northern states, Smith wanted to know how it would fare in the warm, humid climates of the Southeast and the tropics. He also wanted to see if it would produce large enough populations to control B. tabaci.
Unlike in Canada, where its populations explode on mullein plants, D. hesperus populations grew much more slowly in Florida. Even so, it still had an impact on whitefly populations. During a greenhouse trial where 12 predators per plant per week were released for 3 weeks, only 7 whitefly eggs per leaf remained in the containers with the predator, versus 151 on untreated plants; and 14 nymphs per leaf remained in containers with the predator, versus 229 nymphs in the control.
Although the predator reduced whitefly populations, only one whitefly is needed to infect a plant with Tomato yellow leaf curl virus. Virus-resistant varieties are available for field tomatoes, but not for greenhouse tomatoes. Smith says that developing those varieties is the next step toward protecting greenhouse tomatoes from the virus.
Source: IPM in the South
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Other news in this sector:
- 2022-12-02 "We want to give growers more alternatives for crop protection"
- 2022-12-02 “Our ToBRFV-resistant variety has been preferred by our producers in wide areas since 2020"
- 2022-12-01 96% of pepper crops in Almeria and Granada use biological control against pests
- 2022-11-30 UV lamps can control strawberry pests
- 2022-11-28 Bio-Chain project to develop greener solutions for Chinese vegetables
- 2022-11-28 ToLCNDV emerges in China
- 2022-11-28 “Significantly better results with new Iron fertilizers”
- 2022-11-25 Less concerns about the ToBRFV virus this year in Sicily
- 2022-11-25 Growers can use a test kit to detect ToBRFV before plants even shows signs
- 2022-11-24 “With PATS-C we are more timely aware of an infestation”
- 2022-11-18 ADAMA recognized with crop science award for Araddo
- 2022-11-16 Belgian tomato grower raided on suspicion of using prohibited ToBRFV vaccine
- 2022-11-10 "Air pollution threatens natural pest control"
- 2022-11-08 Colored sticky traps for monitoring phytophagous thrips and their impact on beneficial insects
- 2022-11-08 UV light trap catches male and female tomato looper
- 2022-11-07 Asperello gains approval in Denmark and Morocco
- 2022-11-04 "It's really hard to manage this disease"
- 2022-11-03 "ToBRFV also plays 'a big role' in tomato supply disruption"
- 2022-11-01 AMVAC and NewLeaf Symbiotics partner to bring biological solutions to North American crop markets
- 2022-10-27 "Complete package of natural products for all tomato cultivation stages"