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Whitefly: Tecnova trial unveils Nakar’s potential

The new Seipasa natural formulation to control whitefly equals the chemical reference’s effectiveness, plus it does not leave any residue and it is suitable for integrated and organic production

María del Mar Téllez, IFAPA researcher, at the conference on whitefly.

María del Mar Téllez, IFAPA researcher, at the conference on whitefly.

At Tecnova’s headquarter, in Almería’s Technology Park, its researchers presented the results of a test conducted on integrated control of whitefly in greenhouse tomatoes developed in an experimental farm that belongs to the research entity. Next to María del Mar Téllez, researcher at the Institute of Research and Formation on Agriculture and Fisheries of the Government of Andalusia (IFAPA), technicians and producers introduced the most effective tools to deal with this insect, Bemisia tabaci, through preventive measures as well as plant health and biological control.

As explained by Tecnova’s R&D Director, Carolina Martínez, and integrated production technician Carolina Sánchez, this research has proven the high effectiveness of treatments that employ SEIPASA’s biopesticides on whitefly immature and adult populations.

NAKAR, Zero Residues and no safety term

NAKAR (registry # ES-00123) is a bioinsecticide taken as a reference, which show its great capacity to eradicate whitefly populations while shutting of its biological reproduction.

During the trial developed from March to June, we evaluated the insecticidal effectiveness in three experimental treatments compared to an untreated control: control (T0), NAKAR 10 ml/l (T1), NAKAR 6 ml/l + Pirecris 2 ml/l (T2) and Acetamiprid 0.5 g/l (T3).

The Tecnova researchers highlighted the successful process of whitefly pest control with natural products such as Nakar and Pirecris, as well as chemical reference Acetamiprid. The findings of the trial showed that “in all three treatments the insecticidal effect was similar and statistically indistinguishable from each other”, which confirms the effectiveness of Seipasa’s natural formulations equals the chemical reference, with added value too – it doesn’t leave behind residues in the crop and that makes it suitable for integrated and organic production.

Evolución de la severidad - Adultos Bemisia tabaci

Thus, the insecticide potential of the newly formulated NAKAR that was stated in this trial adds up to the advantage of being a zero residue product, which does not require safety periods. Similarly, its synergy with Pirecris, another botanical-based bioinsecticide, has proven a tight control of Bemisia tabaci.

As the conclusions stated in, both solutions cause direct and immediate effects on pests: “They have produced desiccation in immature stages and a loss of cohesiveness in the adult stage. In both cases, direct contact of these products has led to the death of insects”.

Fases inmaduras de la mosca blanca antes y despúes de los tratamientos, y efectos de los tratamientos sobre la fase adulta

In this line, Seipasa’s technical director, Xavier Nácher, emphasized the accomplished goal of this new solution hitting the market: “NAKAR achieves the eradication of the pest penetrating the insect’s cell membranes and causing its dehydration, by disruption of the waxy layer, and death”.

Xavier Nácher, Seipasa’s Technical Department Director.

Xavier Nácher, Seipasa’s Technical Department Director.

As Nácher stated, NAKAR’s action causes cytolysis of the insect cells, in other words, the breakdown or decomposition of the membrane, so it loses cell material and vital processes stop. Furthermore, it blocks the insect’s spiracles, which leads to its suffocation.

The NAKAR’s natural base makes it a privileged tool for Integrated Pest Management (IPM) strategies, as well as resistance management programs, to which it shows optimum results.

NAKAR use strategies

As Nácher explained, NAKAR can be used as a solution against whitefly in crops:

1) Intended for zero residues production, it must be applied as soon as the pest appears in order to shorten its life cycle and consequently its spread. Similarly, it can be used in the crop’s final stage to guarantee residues free harvests.

2) In order to set Integrated Pest Management (IPM) strategies and resistance management, NAKAR can be used with other insecticides that do have a security term in the middle period of the cycle.

3) Similarly, its effective insecticidal action, substantiated by recent trials, make it an alternative for the most demanding organic production.

Curva degradación residuos cero

How to achieve zero residues crops in conventional agriculture

Towards Zero Residues in traditional agriculture

Any conventional agricultural production -thus not restricted to organic agriculture- can get fruit, vegetables and grains free of chemical residues, Zero Residues. How? We will explain.

To be clear about this process, we should talk about the so-called degradation curves or waste disposal curves. Which are the graphical representation of the evolution over time of residues present in plants treated with pesticides.

The application of pesticides generates a deposit (amount of the substance that remains in the plant immediately after treatment), which depends on the product used, its formulation, the presence of adjuvants, of the application, the vegetable’s morphology, of the weight-surface ratio of and of weather conditions at the time of application.

Since the initial deposit, occurs a progressive degradation of the pesticide by mechanical, physical and chemical agents, derived from climatic factors (temperature, wind, rain, humidity, sunshine) and the nature of the plant and the pesticide.

This process may be foreseen according to models that set the rate of heat loss, setting curves that let us learn theoretical concentrations for a particular application time.

teoretica curveThat is why curves of authorized pesticides for each crop allow us to know how the residues content changes over time in the fruit and, thus, determines the “safety periods” (minimum period of time that must elapse between treatment and harvesting the product, or the entry of cattle in the treated plot).

Maximum Residue Limits (MRLs)

The danger of a residue is determined by the toxicity of its active material, the characteristics of the formulation, the potential metabolites generated by the degradation process itself, its bioaccumulation, the amount of residues in the collection or consumption, and the degree of exposition.

In order to protect public health against the toxicity of chemical residues in agricultural products, they are regulated by the Maximum Residue Limits (MRLs) rules.

This is the maximum amount of chemical residues that plant products may contain when they reach the market; that is, the allowed concentration acceptable for long term human or  animal consumption.

In conventional agriculture, following the best practices implies crops that do not exceed those Maximum Residue Limits if the legally established criteria (dose, timing, adjustment of product-cultivation…) is respected.

Residues degradation to zero

Degradation curve phytosanitariesThe curve process is as follows: There is a brief latency period, after which a progressive decrease in the residues concentration (dissipation area) is reported. This comes to a point where degradation occurs more slowly (persistence zone) until reaching the harvest period, in which the parameters of the Maximum Residue Limits (MRLs) must be met.

Also, it must be kept in mind that in many cases several applications of a pesticide are necessary at different times of the production cycle, which causes the degradation curve to move to the right. This way, the closer the harvesting time, the more residues will reach the final production.

But, in addition to this method, the practice leads to focus on another highly effective and even more natural formulation: planning each crop following the Integrated Pest Management (IPM) strategy with the added goal of a ‘zero residues’ crop.

Thus, it is established as the main performance in pest control prioritization mechanisms of natural regulation as the use of biological control and the use of plant protection products compatible with biological control organisms (OCB) are like SEIPASA biopesticides, of so that free crop residues is guaranteed from the beginning.

Degradation curve, Zero Residues

SEIPASA biopesticides degradation curve, highly specialized in removing different pests, has dissipative and persistence periods with more convergence towards zero, which guarantees a residues-free harvest.

This ensures fruits, vegetables and cereals without toxic remains reach the population tables, not even legally permitted levels.

Value-added harvest

All of this adds value to the agricultural product, both in quality (nutritional, sensory and visual) and nutritional health, which more and more consumers ask for, along with large retail chains. Moreover, major retail outlets are no longer satisfied only with respect to Maximum Residue Limits, they ask for much lower levels.

The great effectiveness of SEIPASA biopesticides can keep pests at bay while protecting the crop in a more natural, sustainable and healthy way, but also avoids the harmful effects caused by chemical pesticides such as some plants’ sensitivity to pests or diseases or some pests’ resistance to pesticides, which make them not only useless but also contaminants.

It must be kept in mind, as discussed before, that synthetic products can be replaced entirely by SEIPASA’s natural treatments from the cycle start, achieving the same effectiveness. SEIPASA biopesticides are a major element in Integrated Pest Management (IPM).

For more information on the most appropriate biopesticide for each crop and production cycle, and o application times in order to achieve a ‘zero residues’ harvest: