Navigation Links
Detecting disease in greenhouse plants

EDINBURG, TXGreenhouses are an integral part of U.S. agriculture. Nearly $200 million of food is produced in domestic greenhouses each year, and the facilities play a vital role in producing seeds and transplantable vegetation. Understanding how to keep greenhouse plants healthy can translate to increased revenue for producers.

Kenneth R. Summy of the University of Texas-Pan American and Christopher R. Little of Kansas State University (Manhattan) led a study examining the stresses of a variety of greenhouse plants. The study, published in the August 2008 issue of HortScience, used color infrared (CIR) photography.

CIR images are divided into wavebands. Ratios are created comparing the NIR wavebands to red wavebands. High NIR and low red values are typical of healthy vegetation because light is being reflected in the proper proportion. Ratios of colors accentuate even slight differences in light reflection, which can indicate disease.

Trifoliate orange, 'Valencia' orange, sour orange, grapefruit, 'Bo' tree, and muskmelon were infested with sooty mold, insects, and pathogens; all are common ailments in greenhouses. Leaves exhibiting a range of symptoms were chosen to compare with healthy leaves of the same species and photographed using CIR.

Certain diseases such as powdery mildew give the leaf surface a powdery finish. Another disease, sooty mold, appears on the leaf as tan, brown, or even black spots. This image analysis allows for detection of these diseases early on. Color ratio was also affected by the age of the leaf in some cases. The ratios for sour orange leaves that were 10 and 35 days old were significantly different. However, there was no difference between 20- and 35-day-old trifoliate orange leaves. This could affect the efficiency of this method when used on whole-plant foliage.

The study also showed a variation in the accumulation patterns of a particular disease on the two trees in the study. "'Valencia' orange leaves were coated very evenly with insect honeydew, whereas honeydew deposits on 'Bo' leaves were very spotty," reported the researchers. Insect honeydew can contribute to sooty mold growth. As mold infestations increased, the ratio decreased into the unhealthy proportion for all sample plants.

The study points out that this image analysis technology has potential for large-scale use in greenhouses. However, to be most beneficial, the application must be effective in distinguishing the health of plants, cost-effective enough for the purchase of CIR cameras and equipment, and user-friendly so that on-site software processing of data can be completed easily.


Contact: Michael W. Neff
American Society for Horticultural Science

Related biology news :

1. Pitt researchers use fluorescence to develop method for detecting mercury in fish
2. Detecting tiny twists with a nanomachine
3. Men are better at detecting infidelities
4. Atomic-resolution views suggest function of enzyme that regulates light-detecting signals in eye
5. Detecting dangerous chemicals with lasers, exploring the brains circuitry with light and more
6. Detecting the snake in the grass
7. New, noninvasive prostate cancer test beats PSA in detecting prostate cancer
8. PET/CT imaging proves golden for detecting cancer in children
9. Scat sniffing dogs detecting rare California carnivores
10. McMaster researchers discover new mode of how diseases evolve
11. Engineers create intelligent molecules that seek-and-destroy diseased cells
Post Your Comments:
Related Image:
Detecting disease in greenhouse plants
(Date:11/2/2015)... PARK, Calif. , Nov. 2, 2015  SRI ... $9 million to provide preclinical development services to the ... the contract, SRI will provide scientific expertise, modern testing ... wide variety of preclinical pharmacology and toxicology studies to ... --> The PREVENT Cancer Drug Development ...
(Date:10/29/2015)... -- Connected health pioneer, Joseph C. Kvedar , MD, ... and wellness, and the business opportunities that arise from ... of Healthy Things . Long before health and ... Kvedar, vice president, Connected Health, Partners HealthCare, was creating ... from the hospital or doctor,s office into the day-to-day ...
(Date:10/27/2015)... 27, 2015 Synaptics Inc. (NASDAQ: SYNA ), ... Google has adopted the Synaptics ® ClearPad ® ... power its newest flagship smartphones, the Nexus 5X by ... --> --> Synaptics works ... strategic collaboration in the joint development of next generation ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... -- Studies reveal the differences in species ... the way for more effective treatment for one of the ... --> --> Gum disease ... cats, yet relatively little was understood about the bacteria associated ... conducted by researchers from the WALTHAM Centre for Pet Nutrition ...
(Date:11/25/2015)... 2015 Orexigen® Therapeutics, Inc. (Nasdaq: OREX ... fireside chat discussion at the Piper Jaffray 27th Annual ... The discussion is scheduled for Wednesday, December 2, at ... A replay will be available for 14 days after ... Julie NormartVP, Corporate Communications and Business Development , BrewLife(858) ...
(Date:11/24/2015)... , Nov. 24, 2015 Cepheid (NASDAQ: ... be speaking at the following conference, and invited investors ... York, NY      Tuesday, December 1, 2015 at ... York, NY      Tuesday, December 1, 2015 at ... Healthcare Conference, New York, NY ...
(Date:11/24/2015)... 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS) (TSX: AEZ) ... of the Toronto Stock Exchange, confirms that as of ... corporate developments that would cause the recent movements in ... --> About Aeterna Zentaris Inc. ... Aeterna Zentaris is a specialty biopharmaceutical company engaged ...
Breaking Biology Technology: