Movement of Rhyzopertha dominica in response to temperature gradients in stored wheat

The consequences of infestation of bulk-stored wheat by multiple species of insects were determined for 60 weeks at 30 ± 2 °C. Eight 204-L drums containing wheat at 15.5% moisture content were used as three distinct systems: (I) Control system (two drums), insect free; (II) RST system (three drums), infested with the grouping of Rhyzopertha dominica F., Sitophilus oryzae (L.), and Tribolium castaneum (Herbst); and (III) COT system (three drums), infested with the grouping of Cryptolestes ferrugineus (Stephens), Oryzaephilus surinamensis (L.), and T. castaneum. At triweekly intervals carbon dioxide, oxygen, temperature, grain moisture, seed damage, grain weight, dust weight, fat acidity values (FAV), seed germination, microflora, and the numbers of insects and the mite Tarsonemus granarius Lindquist were measured. Seeds died by week 15 and bacterial infection on them increased in all systems. The seed FAVs in the RST system peaked by week 30 and then declined steadily while these values were increasing continuously in the Control and levelling off in the COT systems. Insects multiplied exponentially for 6–15 weeks and then declined sharply or maintained oscillating populations; Sitophilus and Oryzaephilus were unable to survive in the presence of the other insects.

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Analysis of volatiles from stored wheat and Rhyzopertha dominica (F.) with solid phase microextraction-gas chromatography mass spectrometry

Journal of the Science of Food and Agriculture ◽

10.1002/jsfa.7274 ◽

2015 ◽

Vol 96 (5) ◽

pp. 1697-1703 ◽

Cited By ~ 8

Author(s):

Yonghao Niu ◽

Lei Hua ◽

Giles Hardy ◽

Manjree Agarwal ◽

Yonglin Ren

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Solid Phase Microextraction ◽

Solid Phase ◽

Rhyzopertha Dominica ◽

Gas Chromatography Mass Spectrometry ◽

Stored Wheat ◽

Chromatography Mass Spectrometry

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Impact of resistance to fenitrotion and esfenvalerate on the control of Rhyzopertha dominica (Coleoptera: Bostrichidae) in stored wheat

Revista Colombiana de Entomología ◽

10.25100/socolen.v46i2.7612 ◽

2020 ◽

Vol 46 (2) ◽

pp. e7612

Author(s):

Javier Alberto Vásquez-Castro ◽

Gilberto Casadei De Baptista ◽

Casimiro Dias Gadanha Jr. ◽

Julio Cesar Bracho-Pérez

Keyword(s):

Rhyzopertha Dominica ◽

Application System ◽

Stored Wheat ◽

Control Programs ◽

Insecticidal Effect ◽

Factors Influencing ◽

Number Of Individuals ◽

Residual Action ◽

Brazilian Populations

Insecticides resistance can significantly compromise the control programs of Rhyzopertha dominica (Coleoptera: Bostrichidae), one of the main wheat pests in warehouses. The objectives of this work were to study the occurrence of resistance to fenitrothion and esfenvalerate in two Brazilian populations of R. dominica from Santa Rosa (SR lineage) and Campo Grande (CG lineage), as well as the insecticidal effect and residual action of these insecticides when used alone or as a mixture in stored wheat. The application system was calibrated to provide grain treatment at theoretical concentrations of 10 and/or 0.5 mg kg-1 fenitrothion and esfenvalerate, respectively. By comparing the fitted mortality curves for lineages within insecticides, as well as insecticides within lineages significant differences were observed in all cases. Esfenvalerate was ineffective in controlling R. dominica. The SR lineage of R. dominica was more resistant to the insecticides tested than the CG lineage. The number of individuals in the F1 offspring of R. dominica was dependent on the lineage, insecticide, and on the time after the application of insecticide. In the untreated grains (control), the CG lineage had a greater number of progeny than the SR lineage, while the opposite was verified in the grains treated. Fenitrothion and esfenvalerate are not useful for the control of R. dominica. Factors influencing control of R. dominica are discussed in this work.

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