Disease

A&L Biological Inc., a subsidiary of A&L Canada Laboratories Inc., announced their first two products have now moved into the registration phase of development for the Canadian agricultural market. A&L Biological has an established R&D platform for the discovery and development for bio-control and…

Plant diseases are among the most serious challenges that growers face during the crop production crop cultivation process. This problem may be caused by one or more biological agents, such as viruses, bacteria, or fungi. In order to prevent or minimize crop loss and the financial impact caused by…

The present work reveals the beneficial role of sodium nitroprusside (SNP; NO donor concentration: 50 and 100 µM) in mitigation of water stress accompanied by a reduction in viral disease incidence in tomato plants subjected to deficit irrigation. The plants were grown under two irrigation regimes: well-watered (WW; irrigated after the depletion of 55–60% of available soil water) and water deficit (WD; irrigated after the depletion of 85–90% of available soil water) in two seasons of 2018 and 2019. The results indicated that under water stress conditions, plant growth, chlorophyll, relative water content (RWC), and fruit yield were decreased. Conversely, water stress significantly increased the MDA, proline, soluble sugars, and antioxidant enzymes’ activities. Moreover, it was obvious a negligible increase in the fruit content from NO2 and NO3. Water-deficit stress, however, had a positive impact on reducing the percentage of viral disease (TMV and TYLCV) incidence on tomato plants. Similarly, SNP application in the form of foliar spray significantly reduced the disease incidence, the severity, and the relative concentrations of TMV and TYLCV in tomato plants raised under both WW and WD conditions. The treatment of SNP at 100 µM achieved better results and could be recommended to induce tomato plant tolerance to water stress.

When it comes to cultivation, viruses are nothing new. Two years ago, the Tomato Brown Rugose Fruit Virus (ToBRFV) broke out in the Dutch greenhouse horticultural sector. Growers struggle to control this member of the tobamovirus family. For decades now, there's been ongoing research into disinfection…

Fortunately and unfortunately there are so many ways to manage pathogens in a hydroponic nutrient solution. Having options is great but these options can be difficult to navigate for new growers. Hopefully this overview comparing three popular management styles makes it easier to understand the tradeoffs…

News has come out that Russia will not allow imports of tomatoes from Uzbekistan, Turkey, Armenia, Morocco and some other countries anymore due to detection of the pepino mosaic. Speaking with a Russian fruit specialist, it seems this is all true except for the Moroccon imports. They are not able to ship…

Tips on managing disease in your hydroponic system - mailchi.mp/urbanagnews/d3…

According to a statement made by Rosselhoznadzor, shipment of tomatoes and peppers from Antalya and Izmir was banned. As the justification for the decision, it was shown that the tomatoes contained rugose virus, tomato spotted wilt virus and pepino mosaic virus, all of which were brought in from these…

Bacterial spot of tomato and pepper caused by what we now know as X. euvesicatoria pv. euvesicatoria was described for the first time on tomato in 1920 in South Africa. Nowadays, bacterial spot is the name used to describe a specific set of symptoms on peppers and tomatoes - caused by four xanthomonad…

Just like humans, plants can get bacterial infections. These infections can negatively affect yield and quality of fruits and trees. Although some compounds have been developed to protect plants, few of them work on a wide variety of crops. Also, bacteria are constantly developing new resistances. Now,…

Abiotic and biotic stresses both decrease the quality and quantity of cultivated plants. In this study, in order to see the responses of cucumber plants to drought stress and cucumber downy mildew infection, downy mildew infestation at different two levels, B1 (disease infestation) and B2 (no disease infestation), along with three fertigation requirement levels, full fertigation T1, moderate nutrient solution deficit T2 and severe nutrient solution deficit T3, were applied in a greenhouse. Thus, six treatments, i.e., B1T1, B1T2, B1T3, B2T1, B2T2 and B2T3, were set. The leaf gas-exchange parameters were significantly increased under CK (control experiment, B2T1: no disease infestation and full irrigation) treatment, and leaf photosynthesis rate, transpiration rate and stomatal conductance were significantly decreased under the B1T1 treatment. Leaf intercellular CO2 concentration was significantly increased under B1T1 treatment. Leaf photosynthesis rate, transpiration rate, intercellular CO2 concentration and stomatal conductance were significantly decreased under B1T2, B1T3, B2T2 and B2T3 treatments.

Just like humans, plants can get bacterial infections. These infections can negatively affect yield and quality of fruits and trees. Although some compounds have been developed to protect plants, few of them work on a wide variety of crops. Also, bacteria are constantly developing new resistances. Now,…

Syngenta Vegetable Seeds today announced the launch of its first commercial Tomato brown rugose fruit virus (ToBRFV) resistant variety, available in early 2021. The new variety will be released in areas where growers face severe disease pressure from the virus and will support against crop losses.   “The Syngenta Vegetables…

Cucumber green mottle mosaic virus (CGMMV) is a re-emerging threat to greenhouse cucumber and other Cucurbitaceae crop production worldwide. This seed-borne virus can easily spread from a contaminated seeds to seedlings and to adjacent plants through mechanical contact of the foliage of diseased and healthy plants causing extensive yield losses. Additionally, infection may not be limited to the current crop but may also affect subsequent crops due to the long-term persistence of the virus on contaminated crop residues, greenhouse hard surfaces and soil or soil-less greenhouse substrates. In the present work, three greenhouse experiments were conducted to develop an integrated pest management strategy towards controlling CGMMV in commercial cucumber greenhouses, by implementing an effective sanitization program and using resistant and grafted cucumber varieties. Results of sanitization highlighted that pressure washing and cleansing with an alkaline foam cleanser eliminated CGMMV on some of the most heavily infested areas. However, three successive applications of cleanser and disinfectants were essential to completely eliminate CGMMV on porous and uneven surfaces, such as cement alleyway, tray gutters and floor mats.

Recently discovered interactions between plant and viral proteins open up new avenues for making plants resistant to viruses, thus safeguarding crop yields in changing climate conditions. Many diseases caused by common plant viruses reduce the crops of important food plants. In the worst case, potato…

Tomato is an economic crop worldwide. Many limiting factors reduce the production of tomato, with bacterial wilt caused by Ralstonia solanacearum being the most destructive disease. A previous study showed that the disease resistance to bacterial soft rot is enhanced by Bacillus amyloliquefaciens strain…

The Fusarium oxysporum Species Complex (FOSC) comprises a wide diversity of plant pathogenic fungi, causing severe disease in a wide range of economically important crops including banana, cotton, melon, tomato and over 100 others. The group also contains nonpathogenic isolates, some of which have been…

The latest advances in our understanding of the plant immune system are mapped out in a new review by John Innes Centre researchers. A molecular roadmap to the plant immune system is a detailed look at immune receptor function at the molecular level – with a focus on cell surface and intracellular immune…

Red and blue light are the major wavelength which are absorbed by leaf tissue and used for photosynthesis while others, i.e yellow and green light are reflected giving the plants their natural color. Far-red light (FR), which is invisible to the human eye, is transmitted by green plant tissues and…

As published on Monday 26 October in the Official Journal of the European Union (EU), the European Commission (EC) has updated the legislation on measures against the introduction and spread of the Cucumber mosaic virus in tomato seeds, repealing Decision 2004/200/EC and adopting measures against the…

As published on Monday 26 October in the Official Journal of the European Union (EU), the European Commission (EC) has updated the legislation on measures against the introduction and spread of the Cucumber mosaic virus in tomato seeds, repealing Decision 2004/200/EC and adopting measures against the…

Prime Diagnostics, part of Wageningen University & Research, has developed a new antiserum that can specifically detect Tomato brown rugose fruit virus (ToBRFV) in infected plant material and seeds. The antiserum is intended to be used in DAS-ELISA, a testing method commonly used by inspection services…

Plants are able to keep growing indefinitely because they have tissues made of meristems—plant stem cells—which have the unique ability to transform themselves into the various specialized cells that make up the plant, dividing whenever appropriate and producing new cells of whatever type as needed.…

Relatively few new seed onion varieties have been introduced in recent years. Then, last year, the Dutch company, Syngenta, introduced the Promotion. And the Nation variety is set to be launched new year. "These varieties are available in the short term already. But, we have something new in store for…

Lemon tree grows in a subtropical climate and bears a sour yellow coloured fruit when ripe. Lemon trees are affected by insects like Asian citrus psyllid and citrus rust mites. Both can be dealt with spraying oil onto the trees. Diseases include Citrus canker, Greasy spot, Anthracnose etc.

“The first thing is to understand the controlling factors. How do you make sure of the soil and the water quality health. Our job is the water quality.” Outside of heavy metals, some micro-nutrients are toxic to plants in moderate concentrations or specific conditions.  KETOS looks at water quality…

Learn how to prevent and manage diseases in nurseries and greenhouses. Disease Management is the fourth course of the award-winning Greenhouse Online Training courses offered by the University of Florida IFAS Extension. This intermediate course is designed for growers with some experience and training…

A multi-institution, international study led by Texas A&M AgriLife Research will investigate how a process that triggers DNA repair in plants also plays a role in strengthening their disease immunity. Understanding key functions of the process, which is well-studied in humans, will help scientists design…

The Moyer family settled in Ontario in 1799 and have been farming in the Niagara Peninsula ever since. In keeping with tradition, Paul Moyer is the 9th generation of Moyer farmers, but he went far beyond the tradition when he became the co-founder of Clēan Works Corporation: a produce cleaning technology…

Canadians are being warned to avoid some fresh peaches from a California company after a salmonella outbreak in the United States. Prima Wawona has recalled fresh peaches with various brand names due to possible salmonella contamination.