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sitophilus oryzae morphology

Elytra with 2 pairs of paler, reddish spots and >20 circular depressions on the pronotum, located along the longitudinal midline.

2012. They are shiny and reddish-brown to black in colour and pitted with numerous punctures. This finding confirms observations by Rozek et al. Observation of meiotic cells indicated the sex pair exhibiting a parachute configuration, as in S. granarius.

In summary, we were able to describe the karyotype of the tamarind weevil and extend the karyotypic analysis of the maize weevil, allowing a comparative cytogenetic characterization of the four Sitophilus grain weevils (S. granarius, S. linearis, S. oryzae, and S. zeamais).

Analysis of meiotic cells confirmed that the sex pair exhibited the parachute configuration, as in S. granarius and S. oryzae. In contrast, this species possesses 2n=24 chromosomes, while the chromosome number of 2n=22 represents the plesiomorphic condition for this genus, as already discussed, what allows for an alternative explanation for the neo-XY system. accounting for a more complex gene regulation in species with larger genome size, as reported for eukaryotes (Comeron 2006, Biscotti et al. Dent D. (2000). Such information is also important to clarify the relationship between variation in genome size and chromosome number (Tsutsui et al. Sitophilus Linnaeus, 1758 grain weevils can benefit from such tools as key pest species of stored products and also as sources of archeological information on human history and past urban environments. The maize weevil is typically somewhat larger than the rice weevil, but rice weevils as large as the largest maize weevils and maize weevils nearly as small as the smallest rice weevils have been found. Both adults and larvaefeed on internally on maize grains.

We use cookies to help provide and enhance our service and tailor content and ads. The relationship among the four species of Sitophilus grain weevils was determined using a matrix with a total of 20 karyotype characters, where five characters were parsimony informative (exhibiting at least two characters distinct among operation taxonomic units [OTUs]; i.e., the weevil species studied) (Table 2). The submetacentric X chromosome was the longest element in the karyotype, while the Y showed a subtelocentric morphology equal in size to one of the medium-sized chromosomes (Fig. Chaisaeng, P., Chongrattanameteekul, W., Visarathanonth, P. and Vajarasathiara, B. BioNET-EAFRINET Regional Coordinator: eafrinet@africaonline.co.ke, Sitophilus granarius (Linnaeus, 1875) - Granary Weevil, It is possible to confuse the granary weevil with other storage insect pests such as the larger grain borer – LGB (. However, the results of these earlier efforts involving grain weevils were discrepant, emphasizing the need for further and more reliable analysis. Evaluation of different temperature management strategies for suppression of Sitophilus zeamais (Motschulsky) in stored maize.

2004). © 2017 Elsevier Ltd. All rights reserved.

2015). Control of weevils involves locating and removing all potentially infested food sources.

However, emergence holes are large and rugged and the beetles may be seen on the commodities’ surface. 1995, Lachowska et al.

1c). Granary weevil Sitophilus granarius. 2002, Gregory 2005, Geraci et al. The maximum parsimony tree shows only nodes with bootstrap support > 50. A synthetic version is available which attracts rice weevils, maize weevils and grain weevils.

Some external features can be used to differentiate the vast majority of adults, but the only reliable features are on the genitalia (see table below). (2015), the karyotype of this species had 2n = 22 chromosomes. The karyotype of this species also exhibited 2n=24 chromosomes, which gradually decrease in size. Chemical control: A combination of low dosages of vegetable oils and an organophosphate (pirimiphos-methyl) was highly toxic to immatures and adults of S. zeamais. 2008, Tavares et al.

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