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Parameters to be considered in the pulverization of the fungus Isaria fumosorosea for the management of Diaphorina citri The insect vector Diaphorina citri Kuwayama 1907 (Hemiptera: Liviidae) is the main citrus pest in the world. The control of this pest is done almost exclusively with chemical insecticides, and there is a demand for more sustainable control alternatives. The development of a bioproduct based on entomopathogenic fungi may be a promising alternative for the integrated management of D. citri in commercial citrus orchards. The objective of this study was to evaluate important parameters to increase efficiency of applications of the entomopathogenic fungus Isaria fumosorosea ESALQ-1296 for the control of D. citri. The following studies have been developed: 1the action of adjuvants on adhesion and germination of I. fumosorosea on nymphs and adults of D. citri; 2the relationship between the conidia viability and the mortality of D. citri; 3the effect of relative air humidity and ultraviolet radiation on the efficacy of I. fumosorosea under laboratory conditions; 4 the period between the application of chemical fungicides and I. fumosorosea in field; 5the selectivity of I. fumosorosea to the natural enemies Tamarixia radiata and Ceraeochrysa cincta under laboratory conditions; 6 the volume of syrup suitable for I. fumosorosea applications for the control of D. citri in commercial orchards; 7the efficiency of I. fumosorosea to management of D. citri and its effect against other species of arthropods in two systems of citrus production. Scanning electron microscopy analysis revealed that the addition of the adjuvants KBRAdj and Silwet L-77 accelerated the development of I. fumosorosea conidia on the cuticle of all stages of the insect compared to Tween 80. The formulations of I. fumosorosea with KBRAdj 0.075% showed better performance in controling D. citri at all moisture levels, but especially in periods of low relative humidity (≤50%) and exposure to UV-B radiation (> 2 hours) compared to Tween application. The fungicides Kumus ® DF, Kocide ® WDG, Nativo ® , Flint 500 ® WG did not influence the performance of the entomopathogen when they were sprayed the day before or after application of the fungus on D. citri adults. In the selectivity studies, it was shown that most of the mixtures of I. fumosorosea with the adjuvants were innocuous for the adults of T. radiata and the neonates of C. cincta. In commercial orchards, it was demonstrated that I. fumosorosea applications were more efficient in the volume of 60 mL.m 3 of leaves. In the area with organic citrus production it was verified that I. fumosorosea applications significantly reduced the natural population of D. citri and the false spider mite (Brevipalpus spp.). In the area with conventional citrus production it was observed that sprays of I. fumosorosea significantly reduced the population of the false rust mite (Phyllocoptruta oleivora) and D. citri population was extremely low in all treatments. The applications of I. fumosorosea did not present negative effects in the populations of the ladybirds, lacewings and hemerobide predators. Therefore, it is concluded that the use of I. fumosorosea fungus in the management of D. citri can be a sustainable tactic to minimize the systematic applications of pesticides, reducing their impacts on the agroecosystem.

Parâmetros a serem considerados nas pulverizações do fungo <i>Isaria fumosorosea</i> para o manejo de <i>Diaphorina citri</i>