Weather-based decision support reduces the fungicide spraying to control onion downy mildew

Araújo, Edivânio Rodrigues de; Alves, Daniel Pedrosa; Knoth, José R.

doi:10.1016/j.cropro.2016.10.022

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…De maneira geral, as substâncias alternativas no manejo de míldio em cebola até o momento avaliadas têm demonstrado pouca eficiência na redução de severidade com incremento de produtividade (WORDELL FILHO et al, 2007;ARAÚJO et al, 2017b). Isso faz com que o controle do míldio seja realizado basicamente com uso de fungicidas sistêmicos e/ou protetores (DEVELASH; SUGHA, 1997;ARAÚJO et al, 2017a). Sendo assim, é importante que novas substâncias/moléculas sejam avaliadas, com o intuito de racionar a frequente aplicação de fungicidas e integrar o manejo da doença.…”

Section: Resultsunclassified

“…Esses autores observaram que a produtividade pode ser similar ao convencional em ano agrícola com menor incidência do patógeno em sistemas racionais com menor uso de fungicidas. Porém, sob alto potencial de inóculo, o míldio pode causar perda de área foliar significativa em plantas de cebola nas condições de sul do país com reduções significativas de produtividade (ARAÚJO et al, 2017a).…”

Section: Doses De Cinza De Casca De Arroz Na Incidência E Danos De Trunclassified

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Doses de cinza de casca de arroz na incidência e danos de tripes e severidade de míldio em cebola em sistema orgânico

Gonçalves¹,

Araújo²,

Neto³

et al. 2017

Revista Vértices

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O objetivo deste estudo foi avaliar o efeito de cinza de casca de arroz carbonizada sobre a incidência e danos de tripes, Thrips tabaci, severidade de míldio, Peronospora destructor, produtividade, rendimento pós-colheita de cebola e características químicas do solo em sistema orgânico. O estudo foi conduzido a campo na Epagri, Estação Experimental de Ituporanga, SC. A cultivar utilizada foi a Epagri 362 Crioula Alto Vale. Os tratamentos foram doses de cinza de casca de arroz carbonizada 5 t ha-1, 10 t ha-1, 15 t ha-1 e testemunha. O delineamento foi blocos ao acaso com cinco repetições. As doses de cinza não influenciam a incidência e danos de tripes, severidade de míldio, teor foliar de potássio, produtividade e rendimento pós-colheita de cebola. As doses de cinza influenciam o teor de potássio no solo em uma relação quadrática positiva e não alteram o pH, matéria orgânica, P, Ca, Al, Mg, e Na.

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Section: Resultsunclassified

Section: Doses De Cinza De Casca De Arroz Na Incidência E Danos De Trunclassified

Doses de cinza de casca de arroz na incidência e danos de tripes e severidade de míldio em cebola em sistema orgânico

Gonçalves¹,

Araújo²,

Neto³

et al. 2017

Revista Vértices

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“…Twenty eight days after transplanting, weekly or alert-based applications were started using a CO 2 -pressurized backpack sprayer, corresponding to spray volume of 500 L per hectare. The severity was assessed fortnightly using a rating description scale (1)(2)(3)(4)(5)(6)(7)(8)(9), which assigns scores to the entire plot (Mohibullah 1991). The values from scale scores of the experimental plots were used to calculate the area under disease progress curve -AUDPC (Shaner and Finney 1977).…”

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confidence: 99%

Using partial resistance and a disease alert system to reduce the number of sprays to control onion downy mildew

Araújo,

Resende

2023

Preprint

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Downy mildew is a production limiting factor for Brazil's main onion producing region. In the present study we adopted two management strategies (resistant cultivar and disease alert system) with the aim of reducing the number of systemic fungicide sprays, maintaining satisfactory yield levels. By carrying out fungicide sprays only when the alert system indicated a severe risk and using the cultivar “SCS379 Robusta”, it was possible to reduce the number of sprays from 11 (calendar) to 5 (alert system), maintaining statistically similar yields (32.58 ton./ha – calendar; and 30.76 ton/ha – alert system). Furthermore, considering only the value of the fungicide, the production cost was BRL 0.069/Kg – calendar, and BRL 0.033/Kg – alert system. Integrated management, using different control strategies, appears to be a viable alternative to mitigate the damage caused by onion downy mildew.

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“…Therefore, we regard the assignment of pesticide spraying tasks as a team orienteering problem (TOP). With this problem, as the efficacy of pesticide spraying is mainly related to the temperature during spraying [3], the time window of spraying each farmland varies. Meanwhile, the UAV spraying strategy within a farmland can affect the UAV flight distance and change the time for the UAV to reach the next farmland, thus affecting the efficacy of the pesticide spraying for the next farmland.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Pesticide Spraying Tasks via Multi-UAVs Using Genetic Algorithm

Luo

Niu

Zhu

et al. 2017

Mathematical Problems in Engineering

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Task allocation is the key factor in the spraying pesticides process using unmanned aerial vehicles (UAVs), and maximizing the effects of pesticide spraying is the goal of optimizing UAV pesticide spraying. In this study, we first introduce each UAV's kinematic constraint and extend the Euclidean distance between fields to the Dubins path distance. We then analyze the two factors affecting the pesticide spraying effects, which are the type of pesticides and the temperature during the pesticide spraying. The time window of the pesticide spraying is dynamically generated according to the temperature and is introduced to the pesticide spraying efficacy function. Finally, according to the extensions, we propose a team orienteering problem with variable time windows and variable profits model. We propose the genetic algorithm to solve the above model and give the methods of encoding, crossover, and mutation in the algorithm. The experimental results show that this model and its solution method have clear advantages over the common manual allocation strategy and can provide the same results as those of the enumeration method in small-scale scenarios. In addition, the results also show that the algorithm parameter can affect the solution, and we provide the optimal parameters configuration for the algorithm.

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Weather-based decision support reduces the fungicide spraying to control onion downy mildew

Cited by 10 publications

References 17 publications

Doses de cinza de casca de arroz na incidência e danos de tripes e severidade de míldio em cebola em sistema orgânico

Doses de cinza de casca de arroz na incidência e danos de tripes e severidade de míldio em cebola em sistema orgânico

Using partial resistance and a disease alert system to reduce the number of sprays to control onion downy mildew

Optimization of Pesticide Spraying Tasks via Multi-UAVs Using Genetic Algorithm

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