Potato Verticillium Wilt Prevention and Biological Management for Healthier Potato Crops

Potato Verticillium wilt is a vascular disease of the soil that is primarily associated with Verticillium dahliae. Rather than attempting to cure plantings heavily infested during the current crop year, it is best to reduce the amount of soil inoculum and for verticillium wilt prevention the next year's crops from being affected by disease in an integrated management program.

Crop rotation, clean or disease free plantings, cultivar selection, soil management, field sanitation and bio-control can all be an effective management strategy to know how to cure verticillium wilt. Penicillium Bilaiae based bio-products should be taken as a supplemental measure in this program. However, their performance depends on factors such as the strain used, formulation, application method and field conditions. In the coming paras, we will discuss verticillium wilt potato treatment.

What is the Potato verticillium wilt?

It can also cause reduced sprouting and diminished tuber yield.This tenacity from a farmer's point of view is a problem with disease establishment.

Pathogen persistence in soil makes the need for management to occur before signs of disease become apparent. Farmers must pay attention not only to this potato harvest, but the impact of their actions this cash season on disease pressure for future seasons. A long-term strategy may be based on practices related to sustainable agriculture, including good crop rotation, using a healthy approach to quality planting material, how the ground area is utilized and proper sanitation of the field.

Biological control may also be used as a complement of these cultural and preventive practices and can include the use of or promotion of beneficial microorganisms in the crop root zone. You should consider it as part of a comprehensive disease management strategy, rather than an alternative to crop rotation, clean seed, cultivar choice etc.

What is Verticillium wilt and Identifying it?

The upper part of the plant may still appear healthy. When the plant is cut open, it will be observed that the vascular tissue has discolored and shrunken. Symptoms of Verticillium wilt can take a long time to appear and may sometimes take a couple of years to appear.

Light brown vascular discoloration can be seen when the lower stem is severed. Some infested seed potatoes may also show brown ring at the stem end of the tuber around the vascular ring.

One major concept which is important for growers to remember is that these symptoms do not necessarily coincide with a diagnosis of potato verticillium wilt dahlia diseases. Other diseases, nematodes or environmental stresses and root problems may also cause vascular browning, wilting and a non-uniform loss of plants. Crop history, symptomatology, root condition, and laboratory analyses can be used if needed, should all be considered in a field diagnosis.

Can Verticillium Be Confused With Other Potato Diseases?

Timely identification of potato verticillium wilt helps in management decision making for the current crop in the field and the subsequent crops.

What are the most important causes of verticillium wilt in potatoes?

How to control verticillium wilt​? Farmers are better able to recognize the ways in which the verticillium wilt causes disease can be hosted and maintained by an understanding of the cause of the disease. Verticillium inoculum in soil is a problem since microsclerotia last for extended periods in soil. Infected plant materials can also aid in dissemination or maintenance of the pathogen in the field and the movement of infested soil is a factor in its dispersion or maintenance.

In the presence of appropriate host roots, microsclerotia can germinate, giving rise to infection structures that enable the pathogen to infect the host plant through the roots. It then gets translocated to the water conducting vascular tissue of the plant. This may disrupt the flow of water and help cause observed loss of uniformity in growth and wilting/senescence.

Disease development may also be modified by the environment, including abiotic factors and stresses, and by biotic factors, such as plant pathogens. Symptoms may be worsened by heat and water stress conditions, and root-feeding nematodes can damage the roots and may exacerbate the problem of Verticillium wilt. This is the reason why the farmer should look at the overall entity – the soil and the root system – and not at Verticillium alone.

What Makes Potato Verticillium Wilt a Hard-to-Control Disease?

It can be present as a field-management problem for more than one season after establishment. The strategy is therefore quick to eliminate disease pressure rather than to pursue the goal of curing high levels of infection with a later improved crop rotation.

This alters the concept of management of a Verticillium-infected field for farmers. The removal of visibly infected plants is not necessarily enough to remove the microsclerotia already in the soil. Similarly, there is a lack of relationship between just being planted and a decrease in the pathogen's population level since some rotation crops might also be susceptible or maintain inoculum potential.

Due to the wide host-range, rotation may become more complex. Farmers should determine if they wish to plant proposed rotation crops in the field or if they want to have inoculum. Management could be difficult due to weed hosts. Managing crop selection, weed biological control, and strategies to take the place of one-time intervention to lower pathogen pressure in the field will help to manage a successful long-term strategy.

The Verticillium source outline identifies the following practices as relevant to considerations of sustainable agriculture.

How to prevent potato Verticillium wilt from spreading?

Crop rotation with an appropriate non-host or less-susceptible crop may assist in decreasing V. dahliae populations if farmers use the proper crop to eliminate it. Planning rotation with care however, is warranted, as the pathogen is known to have a wide host range. The use of healthy certified disease-free planting material can assist in reducing introduction, and the use of cultivars that have proven to be less susceptible (where appropriate) will reduce susceptibility.

The importance of sanitation in the fields also cannot be overlooked for sustainable agriculture. Clearing away infected plant material and limiting the transfer of infested soil from field to field or between fields will decrease the amount of soil borne inoculum moving around. Given the potential for continuous potato production to help maintain or raise disease pressure, avoiding reinfestation is another important factor.

Therefore, the verticillium wilt potato treatment should be considered as an overall management plan rather than a treatment to cure the wilt. Biological control products may be used in addition to other methods, but farmers should not expect them to offer a "magic bullet" solution to highly-infected plants.

How Does Biological Control Help Manage Verticillium Wilt?

Biological control of verticillium wilt is achieved by the use of beneficial microorganisms to compete with and reduce soil and root zone plant pathogens. The goal of managing Verticillium is to establish a biological balance in which the soil is more likely to reduce establishment and persistence of soil-borne pathogens, while promoting better root development.

Penicillium Bilaiae is an important group of beneficial fungi investigated for biological management of soilborne plant diseases. Some Penicillium Bilaiae can reduce the availability of space and nutrients of pathogen fungi, directly interfere with pathogen fungi by mycoparasitism, and secrete enzymes or other components that are involved in pathogen suppression. The activities can lead to a more balanced microbial environment around growing roots.

The ability of V. dahliae to control Penicillium Bilaiae has been determined in potato systems with some success, and when used in conjunction with other techniques. In terms of farmer farmers see that this approach allows them to consider microbial products as part of a preventative root-zone management plan, instead of a cure for using the product after large scale vascular infection has been achieved.

How to cure verticillium wilt? The effectiveness of best fungicide for verticillium wilt product use can be affected by the strain, formulation, means of application, environmental conditions and farm input compatibility etc. Farmers need to be mindful of what product they choose and follow the instructions on the product label for each specific product. Most innovative biological control products are best used in conjunction with other parts of a disease-management program and not as single component remedies.

Penicillium Bilaiae: What should potato growers know about?

The beneficial microorganisms used for the formulation of Penicillium Bilaiae products are able to colonize around plant roots and can interact with other microorganisms in the crop environment. Complementary biological solutions to soil borne diseases are products of increasing interest to farmers as they can be used in a preventative scheme in addition to conventional chemical inputs.

Appropriately placed by their roots, Penicillium Bilaiae can crowd out other fungi, thereby reducing their availability. Others can even directly interact with harmful fungi and generate mycoparasitic enzymes. Another part of a biological disease-management program might be supporting healthy root system growth since healthy roots may aid in coping with stresses in the soil.

Novobac's range of microbial products Cropium includes Penicillium Bilaiae. Farmers should be aware however, that not all products with this species are the same. Variations in strain, formulation and method of application can result in varying performance under various field conditions.

Therefore, selection of Penicillium Bilaiae fungicide should be based on the target crop, approval of use, instructions of formulation and application. Producers should always strictly adhere to the product label and take into account any factors that would restrict the use of a potato program.

What are the options for incorporating Cropium into a Verticillium Wilt Management program?

How to cure verticillium wilt? Cropium, verticillium wilt fungicide, for ground dwelling pathogens that is being marketed as a Penicillium Bilaiae product by Novobac. Potatoes are a common crop in Novobac, and root zone colonization and harmful fungi competition are important aspects of Novobac's biological approach.

A farmer can see Cropium as a part of a preventative root-zone-management program, in addition to crop rotation, selecting healthy planting material and choosing the right cultivar and soil-health practices. This is to provide a biological environment for the development of plant roots, while other strategies will lessen the general disease pressure in the field.

She mentions that Novobac's product information documents refer to a number of application methods, including soil drench, drip irrigation, furrow, and seed treatment applications. Farmers should, however, always consult the product label for direction, dose, timing for the specific crop and regulatory needs.

Cropium vs. Cultural Practices: Why Should Growers Combine Them?

The use of these approaches is valuable because they deal with various aspects of the disease-management issue. The use of Penicillium Bilaiae products can be biological and biological control can be used in conjunction with cultural and preventive measures. It is not appropriate to rely on one intervention but is more appropriate for a persistent soil borne pathogen this would be an integrated approach.

Growers who are considering novelties in innovative biological control products should take into account field conditions and the timing of application, as well as how the product is compatible with other products.

Preventing Verticillium Wilt Over the Long-Term: A Farmer's Strategy

Verticillium wilt prevention is best begun before the next potato crop is planted. Farmers should use certified or clean planting material and not persistently plant potato in consecutive seasons, if disease pressure is high in the previous crop. It is important to carefully plan crop rotation, taking into account the host range of V. dahliae, not all non-potato crops will decrease pathogen populations.

Use of less susceptible cultivars may also be part of a strategy when less-susceptible potato cultivation is available. Farmers should also ensure good field hygiene, cleaning up equipment before going into a new field and minimising the transfer of potentially contamination infested soils. Good weed and other potential host management may also reduce opportunities for the fungus to be present.

These practices can be used in conjunction with biological products like Cropium, verticillium wilt fungicide, as a comprehensive root-zone management program. The goal is not to replace the use of crop rotation, sanitation and healthy seed or soil management but to incorporate biological aspects into a more complete shift towards sustainable agriculture.

Ultimately the best way to successfully manage Verticillium wilt is to view it as a long-term management problem in the field. When dealing with crop protection for the next crop, it is important to take decisions before the symptoms become visible in a wide area of the crop, and that's why integrated biological control and preventive management are important considerations to take into potato production today.

References:

1. Jabnoun-Khiareddine, Hayfa, Mejda Daami-Remadi, and A. Fakher. "Evaluation of Several Indigenous Microorganisms and Some Bio-Fungicides for Biocontrol of Potato Verticillium Wilt." Pest Technology 4 (2010): 35-44.
2. Sadravi, Mehdi, and MAHYA RAHIMIZADEH. "Ten Useful Penicillium Species." University of Yasouj Plant Pathology Science 5.1 (2016): 1-13.