Effect of phytosanitary spray solution storage time on the viability of Beauveria bassiana conidia

• Published in: Pesquisa agropecuária tropical Vol. 49
• Main Authors: Renan Zampiroli, Cleyton Batista de Alvarenga, Bruno Sérgio Vieira, Jair Rocha do Prado, Paula Cristina Natalino Rinaldi, Luiz Fernando Horácio Júnior
• Format: Journal Article
• Language: English
• Published: Universidade Federal de Goiás 01.01.2019
• Subjects: agricultural adjuvants; entomopathogens; fungicide application technology
• ISSN: 1983-4063
• DOI: 10.1590/1983-40632019v4955513

Adverse weather conditions, or mechanical problems and decrease in the application rate, may increase the storage time of the spray solution in the sprayer tank. This study aimed to assess the effect of the phytosanitary spray solution storage on the germination of Beauveria bassiana conidia, with or without agricultural adjuvants. A completely randomized design was used, in a 13 x 5 factorial scheme, consisting of thirteen storage times (0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44 and 48 h) and five compositions for the spray solution (B. bassiana, B. bassiana + Helper Neutrum, B. bassiana + TA-35, B. bassiana + Nimbus and B. bassiana + Orobor). The biological spray solution containing B. bassiana conidia and no adjuvants remained viable for use after preparation and the conidial germination decreased 9.2 times after 48 h when an adjuvant was added.