Soil Effects of Beauveria bassiana on Pupal Populations of the Colorado Potato Beetle (Coleoptera: Chrysomelidae)

1984 ◽  
Vol 13 (1) ◽  
pp. 15-18 ◽  
Author(s):  
Bruce A. Watt ◽  
Roger A. Lebrun
Keyword(s):  
Beauveria Bassiana ◽  
Colorado Potato Beetle ◽  
Potato Beetle ◽  
Soil Effects

scholarly journals Virulence of Beauveria bassiana Strains Isolated from Cadavers of Colorado Potato Beetle, Leptinotarsa decemlineata

Insects ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1077
Author(s):  
Rostislav Zemek ◽  
Jana Konopická ◽  
Eva Jozová ◽  
Oxana Skoková Habuštová
Keyword(s):  
Beauveria Bassiana ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Reference Strain ◽  
The Czech Republic ◽  
Potato Beetle ◽  
Leptinotarsa Decemlineata Say ◽  
Native Strains ◽  
Chemical Pesticides ◽  
Fungus Beauveria Bassiana

The Colorado potato beetle, Leptinotarsa decemlineata (Say), is a serious, widely distributed pest of potato and other crops. This pest is able to defoliate the host plant and cause severe yield loss. Moreover, the pest quickly becomes resistant to many chemical pesticides. Therefore, the development of novel biopesticides targeting this pest is urgently needed. The purpose of this study was to obtain new strains of the entomopathogenic fungus Beauveria bassiana and assess their efficacy against L. decemlineata adults under laboratory conditions. Twelve strains were isolated from cadavers of Colorado potato beetles collected in potato fields in the Czech Republic. Test beetles were treated by suspensions of conidia at the concentration of 1 × 107 spores per milliliter and their survival was recorded daily for three weeks. The results of the bioassays revealed that all new native strains were pathogenic to L. decemlineata adults and caused mortality up to 100% at the end of the trial period with an LT50 of about 7 days. These strains were more virulent than a reference strain GHA and some of them can be recommended for the development of a new mycoinsecticide against L. decemlineata. Our findings also highlight the importance of searching for perspective strains of entomopathogenic fungi among naturally infected hosts.

FOLIAR APPLICATIONS OF BEAUVERIA BASSIANA (BALSAMO) VUILLEMIN FOR CONTROL OF THE COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY) (COLEOPTERA: CHRYSOMELIDAE): AN OVERVIEW OF PILOT TEST RESULTS FROM THE NORTHERN UNITED STATES

1987 ◽  
Vol 119 (11) ◽  
pp. 959-974 ◽  
Author(s):  
Ann E. Hajek ◽  
Richard S. Soper ◽  
Donald W. Roberts ◽  
Thomas E. Anderson ◽  
K. Duane Biever ◽  
...  
Keyword(s):  
United States ◽  
Rhode Island ◽  
Beauveria Bassiana ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Primary Response ◽  
Control Plot ◽  
Pilot Test ◽  
Potato Beetle ◽  
Northern United States

AbstractAn overview of data from five research groups participating in a 3-year pilot test on the efficacy of foliar applications of Beauveria bassiana (Balsamo) Vuillemin for control of Colorado potato beetle, Leptinotarsa decemlineata (Say), populations in the northern United States is presented. Four treatments were used at each site: high and low B. bassiana dosages (5 × 1013 colony forming units (CFU) per hectare (ha) and 5 × 1012 CFU/ha), the recommended insecticide for each region, and an untreated check. The primary response variable was potato yield. For analyses considering test sites as replicates, during all 3 years the highest yields were produced in plots treated with insecticides. Within test sites, yields from plots receiving B. bassiana applications were greater than control plot yields in 8 of 24 trials but in only two of these instances, B. bassiana plot yields also did not differ from insecticide plot yields. Evaluating 1983 data from all states together, no differences were found between either high or low B. bassiana treatments and controls. The 1983 study design allowed no plot replication within states. In 1985, an altered plot design providing within-site replication demonstrated increased yield with increased dosage of B. bassiana when initial egg density was used as a covariate.Potato yields greater than control plot yields were noted with a minimum of 5.39 and 6.62 × 1011 CFU/ha B. bassiana. The lowest B. bassiana concentration producing yields not significantly different from insecticide plot yields was 6.62 × 1012 CFU/ha (Rhode Island, 1984). Defoliation ratings did not differ between B. bassiana treatments and controls in 1984 and 1985, although variability was found between yields.

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