The Effectiveness of Synthetic and Inorganic Substances in Different Apple Scab Control Strategies

Regīna Rancāne (), Alma Valiuškaitė, Laura Ozoliņa-Pole, Guna Bundzēna, Maksims Fiļipovičs and Neringa Rasiukevičiūtė
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Regīna Rancāne: Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry, Kaunas District, LT-54333 Babtai, Lithuania
Alma Valiuškaitė: Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry, Kaunas District, LT-54333 Babtai, Lithuania
Laura Ozoliņa-Pole: Institute for Plant Protection Research “Agrihorts”, Latvia University of Life Sciences and Technologies, LV-3004 Jelgava, Latvia
Guna Bundzēna: Institute for Plant Protection Research “Agrihorts”, Latvia University of Life Sciences and Technologies, LV-3004 Jelgava, Latvia
Maksims Fiļipovičs: Institute for Plant Protection Research “Agrihorts”, Latvia University of Life Sciences and Technologies, LV-3004 Jelgava, Latvia
Neringa Rasiukevičiūtė: Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry, Kaunas District, LT-54333 Babtai, Lithuania

Agriculture, 2024, vol. 14, issue 3, 1-13

Abstract: A two-year trial (2021 and 2022) was performed with five different fungicide and foliar fertiliser application strategies to control apple scab ( Venturia inaequalis ) in integrated apple orchards in Latvia. A strategy of using inorganic fungicides or combining them with synthetic fungicides was compared to a strategy of applications with only synthetic fungicides and untreated control. Furthermore, two strategies included foliar fertilisers to determine whether they may affect apple scab used alone or combined with synthetic fungicides. The timing of the fungicide applications was based on the risk forecasted by the decision support system RIMpro, and fertilisers were used at certain growth stages of the crop. The disease incidence on untreated fruits on cv. Auksis ranged from 38.3% to 59.6%, and on cv. Ligol from 99.3% to 99.5%. Strategies including synthetic fungicides were the most effective against scab on shoot leaves and fruits. The strategy using only inorganic fungicides was effective for low-inoculum orchards. Combining synthetic and inorganic fungicides provided the best apple scab control strategy on fruits, likely helping reduce the resistance selection pressure and residues of synthetic fungicides. Foliar fertilisers were insufficient to control apple scab; they would supplement existing scab fungicide programs.

Keywords: fungicides; fertilisers; Venturia inaequalis; decision support system RIMpro (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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