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Locusts and grasshoppers are dangerous polyphagous pests of agricultural crops. In the present paper, results of screening of Acridoidea populations in the South-Western Russia for microsporidia infections including locusts  Locusta migratoria ,  Dociostaurus maroccanus , and  Calliptamus italicus  and grasshoppers  Chorthippus loratus ,  Oedipoda caerulescens , and  Acrida bicolor,  are presented .  Microsporidia prevalence rates were estimated using light microscopy of fresh smears. Out of 179 specimens of  L. migratoria  sampled between 2002 and 2019 in Krasnodar Territory, Astrakhan and Rostov Regions, none was infected with microsporidia. Similarly, 95 specimens of  D. marrocanus  from Krasnodar Territory (2017) and Dagestan Republic (2009) were also negative for microsporidia. Meanwhile, one positive case was detected for  C. italicus  corresponding to 0.5 % for the total amount of 192 exemplars collected from 2002 to 2019 in Krasnodar Territory, Astrakhan and Rostov Regions. As for grasshoppers, all  Ch. loratus  samplings in Krasnodar Territory in 2017-2019 were infected at the prevalence rates of 2.2-15 %, though no infection was found in 40 specimens in Crimea in 2019. In 56 individuals of  O. caerulescens  collected from Rostov Region and Krasnodar Territory, the microsporidia prevalence rate was 1.8 %. Among 96 specimens of  A. bicolor,  none was infected. In total, the microsporidia prevalence rates were higher in grasshoppers as compared to locusts, the difference being statistically significant at p&lt;0.01.

Prevalence rates of microsporidia in locusts and grasshoppers in South-Western Russia