Dichelops melacanthus (Dallas, 1851)

B, Samanta Letícia Lopes Nanzer, B, Gustavo Henrique Recchia, B, Julie Giovanna Chacon-Orozco, B, Raphael Satochi Abe Silva, B, Jorge Franco Maringoli Cardoso & Leite, Luis Garrigós, 2021, Assessment of entomopathogenic nematodes and their symbiotic bacteria to control the stink bugs Euschistus heros and Dichelops melacanthus (Heteroptera: Pentatomidae) in the soybean-corn succession system, Turkish Journal of Zoology 45, pp. 356-371 : 363-364

carpocapsae to Dichelops melacanthus

Comparing S. diaprepesi AM 163 and S. carpocapsae IP 1 in respect to their virulence to D. melacanthus (more resistant in the previous experiment), both species caused low mortality rates (<25%) ( Figure 8 ), not differing significantly from each other (T test; t = –0.6811; df =

)

%

(

Mortality

0 Sand 200g / 1 cm Sand 1000g / 5 cm Straw 4g / 1 cm Straw 20g / 5 cm

Substrate/layer thickness

0 D. melacanthus E. heros

Treatment

9.7665; p = 0.5116), confirming the greater resistance of D. melacanthus to entomopathogenic nematodes.

3.7. Efficacy of Steinernema diaprepesi to reduce Euschistus heros population in greenhouse

The nematode S. diaprepesi AM 163 caused 72.5% mortality of E. heros adults, differing significantly from the control (5%) (T test, t = 10.42; df = 9.7558; p <0. 0001) ( Figure 9 ).

Figures

Figure 8. Corrected mortality (%) of Dichelops melacanthus (Abbott’s formula) seven days after its exposition to Steinernema diaprepesi AM163 and Steinernema carpocapsae IP1 applied on a double layer straw-over-sand substrate, at the rate of 88.4 IJs/cm² (1000 IJs/insect) (p> 0.05; Student’s t test).

Figure 9. Mortality of Euschistus heros adults seven days after their exposition to the nematode Steinernema diaprepesi AM163 applied on the straw at the rate of 88.4 IJs/cm² (1000 IJs/insect), inside greenhouse (**p <0.01; Student’s t test).