Compatibilidade entre herbicidas utilizados na cultura da cana-de-açúcar e produtos biológicos à base Beauveria bassiana e Metarhizium anisoplia.

Crop management includes the use of phytosanitary products, including herbicides. Therefore, the selectivity of these products to biological control agents, such as entomopathogens, must be evaluated mainly due to their overuse currently occurring in some crops, and to its importance in sugar cane management, therefore, there may be a compromise in the action of biological control agents and cause loss of their efficiency. The present study aimed to evaluate the compatibility of four herbicides (glyphosate, hexazinone + diuron, 2,4 D and atrazine) with the biological products based on Metarhizium anisopliae IBCB425 and Beauveria bassiana IBCB66. The experiment was carried out under laboratory conditions in a completely randomized design with five treatments and nine replications. The fungi were inoculated in Petri dishes containing the BDA (potato-dextrose-agar) with the chemicals, which were compared to the control without the addition of herbicides. The doses used were measured according to the dose recommendation of each product. The evaluation took place 11 days after fungal inoculation by measuring the diameter of the colonies. All treatments differed from which herbicide glyphosate was the most compatible with both entomopathogens, showing higher colony growth when compared to the control treatment. The 2,4 D showed to be the herbicide that presented the highest incompatibility, completely inhibiting the development of M. anisopliae IBCB425 and it was responsible for the lowest growth rate of B. bassiana IBCB66. The hexazinone + diuron and atrazine treatments differed from the control allowing growth of approximately 60 and 75% respectively compared to the control for B. bassiana IBCB66 a M. anisopliae IBCB425, hexazinone + diuron allowed 88% growth and atrazine herbicide was compatible with the control treatment.