Effect of Anisopteromalus calandrae (Hymenoptera: Pteromalidae) in controlling residual populations of Rhyzopertha dominica (Coleoptera: Bostrichidae) in wheat stores

Abstract

The parasitic wasp Anisopteromalus calandrae (Howard) was released at six (5, 10, 20, 30, 40 and 50 pairs) densities to evaluate the effects of different introduction rates in controlling residual populations of the lesser grain borer Rhyzopertha dominica (Fabricius) in wheat grain stored in bulk in 46 m 2 rooms. At the 50-pair density, the parasitoid suppressed 83% of R. dominica in June -July and 74% in August -September. At the 5-pair density, the numbers of F 1 progeny per female were 44 and 51, during the first and second period, respectively while at the 50-pair release rate, only 6 and 7 individuals were recorded, respectively. In a second test, the effects of different materials used for storing were evaluated on both insects. Five hundred (500) grain-residing 20 -22-day-old R. dominica larvae were mixed with 250 g fresh wheat stored separately in each of five types of bags, i.e. jute, calico (Americana cloth), polypropylene, polythene, nylon, then exposed to 50 pairs of A. calandrae. The parasitoid suppressed host populations in all types of bags, except in those made of polythene. The highest percentage (69 and 81%) suppression occurred in calico bags during the June -July and August-September periods, respectively. The lowest suppression of 51 and 57% was observed for polypropylene bags during the respective periods. The parasitoid-induced mortality was positively correlated with the parasitoid density.Résumé. L'influence du nombre de guêpes parasitoïdes Anisopteromalus calandrae (Howard) ((5, 10, 20, 30, 40 et 50 couples) sur la suppression des populations résiduelles du petit bostryches des grains Rhyzopertha dominica (Fabricius) a été étudiée dans des greniers à blé de 46 m 2 . A la densité de 50 couples, le parasitoïde élimine 83% des bostryches en juin-juillet et 74% en aoû t-septembre. A la densité de 5 couples, le nombre de descendants F1/femelle est de 44 et 51 au cours de la première et de la seconde période respectivement alors qu'à la densité de 50 couples, on a dénombré respectivement 6 et 7 *

Effect of releasing the parasitoid Anisopteromalus calandrae (Hymenoptera: Pteromalidae) on certain coleopteran stored products beetles in Egypt

“…Obtained results are in agreement with published results in this manner (i.e. Ahmed, 1996;Lucas and Riudavets, 2002;Biswas et al, 2004;Mahal et al, 2005;Qumruzzaman and Islam, 2005;Ahmed et al, 2006;Ghimire andPhillips, 2007 andNgamo et al, 2007).…”

Some like it hot, some not: influence of extreme temperatures on Lariophagus distinguendus and Anisopteromalus calandrae

“…Many of these criteria have already been investigated for L. distinguendus and A. calandrae. The effects of host age and host availability as part of the host selection process have been examined, for example, by Bellows (1985) and Mahal et al (2005). The ability of L. distinguendus to reduce the population growth of S. granarius was demonstrated by Reppchen et al (2003).…”

“…Many of these criteria have already been investigated for L. distinguendus and A. calandrae . The effects of host age and host availability as part of the host selection process have been examined, for example, by Bellows (1985) and Mahal et al. (2005).…”

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“…These results are consistent with those of Wen and Brower 21 and Ryoo et al 17 . Similarly, Mahal et al 22 , who studied the effect of A. calandrae on the control of S. oryzae in wheat grain, found that the PIM was positively correlated with the parasitoid density.…”