Abstract
The soybean (Glycine max (L.): Fabaceae) is considered the most important agricultural crop in Brazil. Phytophagous tetranychid mites as Mononychellus planki McGregor, Tetranychus ludeni Zacher and T. urticae Koch have been considered pest in soybean crops. Neoseiulus idaeus Denmark & Muma (Phytoseiidae) is a predatory mite of T. ludeni and T. urticae. The aim of the present study was to evaluate the biological performance of N. idaeus when fed on T. urticae, T. ludeni and M. planki, coming from the Northwest region of Rio Grande do Sul state, Brazil. The study was conducted in the laboratory with individual predators supplied with different preys. The mean duration (days) of N. idaeus egg-adult development was similar independently of supplied prey (T. ludeni - 5.29±0.03; M. planki - 5.34±0.05 and T. urticae - 5.23±0.03 days). Female viability was 90% when fed on M. planki and 100% when fed on T. ludeni and T. urticae. Mean fecundity of N. idaeus was lower when fed on M. planki (4.6±1.58 eggs/female) and higher when fed on T. ludeni (21.8±3.22) and T. urticae (26.2±2.41). The mean generation time (T) was lower when N. idaeus fed on M. planki than when fed on T. ludeni and T. urticae. The net reproductive rate (Ro) was 4.42±0.49 on M. planki, 17.77±0.55 on T. ludeni and 20.59±0.48 on T. urticae. The innate capacity for increase (rm) was lower when N. idaeus was fed on M. planki (0.09) and higher when such predator was fed on T. ludeni (0.20) and T. urticae (0.22 females/females/day). These results demonstrated that N. idaeus is able to reach the complete development feeding on all the three tetranychid species. Mononychellus planki demonstrated to provide a sub-optimal diet if compared to T. ludeni and T. urticae.
Highlights
The soybean (Glycine max (L.): Fabaceae) is the most important agricultural crop in Brazil, since the country produced 86 tons during 2013 and 2014, being considered the second largest world soybean producer
The evaluation of N. idaeus strain demonstrate that, when fed on M. planki, T. ludeni and T. urticae, such predator mite may reach the adult phase and lay eggs. These results were similar when N. idaeus was fed on T. ludeni and T. urticae and lower, especially in the adult phase, when N. idaeus was fed on M. planki
The viability was 90% when fed on M. planki and 100% when fed on T. ludeni and T. urticae
Summary
The soybean (Glycine max (L.): Fabaceae) is the most important agricultural crop in Brazil, since the country produced 86 tons during 2013 and 2014, being considered the second largest world soybean producer. During 2013 and 2014, Rio Grande do Sul produced approximately twelve millions of tons Such amount represent 15% of the Brazilian soybean production (CONAB, 2014). Despite several animals might affect soybean crops, a special group responsible to such damage are phytophagous tetranychids mites. This affirmation is reinforced by recent studies that have been reporting high populations of tetranychids mites species (Mononychellus planki McGregor, Tetranychus desertorum Banks, T. gigas Pritchard & Baker, T. ludeni Zacher and T. urticae Koch) in soybean crops (Guedes et al, 2007; Reichert et al, 2014; Rezende et al, 2014; Roggia et al, 2008)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
