This investigation reports on the biological control of Sphenarium purpurascens by using different concentrations of conidia from a native strain of Beauveria bassiana (MABb1) isolated in Puebla, Mexico under laboratory and in situ conditions. Formulations containing this native strain combined with two mesoporous materials (diatomaceous earth “D” and zeolite “Z”) were assayed in order to determine their effect on the mortality of the grasshopper. Concentrations of 3.67 × 10⁸ to 10.30 × 10⁸ conidia mL⁻¹ caused a substantial mortality rate in the fourth-instar nymphs and adults of S. purpurascens. The observed mortality was directly proportional to the concentration of conidia. Under controlled conditions, the highest specific death rate K(d⁻¹) was 0.78 for the formulation containing Z + D + MABb1 at 72 h post-infection. The formulations of D + MABb1 and Z + D + MABb1 caused a noticeable decrease in the population of grasshoppers in the experimental plots with statistical significant differences (α < 0.05). Interestingly, an increase in the mortality of S purpurascens occurred in July, August and September 2017 when the highest incidence of the grasshopper was recorded. Remarkably, the treatment based on Z + D + MABb1, produced an improvement in the yields of experimental maize plots (7847.4 ± 0.70 Kg ha⁻¹) in comparison to control plots (4453.9 ± 0.50 Kg ha⁻¹). These favorable consequences are reported for the first time in corn crops from Mexico.

上的生物控制此调查报告Sphenarium紫丝通过使用不同浓度的分生孢子从天然菌株白僵菌在实验室和在Puebla，墨西哥分离（MABb1）原位条件。测定含有该天然菌株并结合两种中孔材料（硅藻土“ D”和沸石“ Z”）的制剂，以确定它们对蝗虫死亡率的影响。分生孢子mL ^-1的浓度为3.67×10 ⁸至10.30×10 ^8的分生孢子虫和紫癜链球菌的成虫，其死亡率很高。。观察到的死亡率与分生孢子浓度成正比。在受控条件下，含有Z + D + MABb1的制剂在感染后72小时的最高比死亡率K（d ^-1）为0.78。D + MABb1和Z + D + MABb1的配方在实验地块中导致蝗虫种群显着减少，具有统计学显着性差异（α<0.05）。有趣的是，紫pur的死亡率在2017年7月，8月和9月发生增加，当时记录到蚱incidence的发病率最高。值得注意的是，基于Z + D + MABb1的处理提高了玉米试验田的产量（7847.4±0.70 Kg ha ^-1）与对照图（4453.9±0.50 Kg ha ^-1）比较。墨西哥的玉米作物首次报道了这些有利后果。