scholarly journals The effect of diatomaceous earth of different origin, temperature and relative humidity against adults of rice weevil (Sitophilus oryzae [L.], Coleoptera, Curculionidae) in stored wheat

2010 ◽  
Vol 95 (1) ◽  
Author(s):  
Helena Rojht ◽  
Christos Athanassiou ◽  
Bill Vayias ◽  
Nickolas Kavallieratos ◽  
Željko Tomanović ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Diatomaceous Earth ◽  
Sitophilus Oryzae ◽  
Rice Weevil ◽  
Stored Wheat ◽  
Different Origin

RESEARCH PLANNING AND TECHNOLOGY TRANSFER: TWO CASE STUDIES IN SUPPORT OF THE WHEAT INDUSTRY

1988 ◽  
Vol 120 (S143) ◽  
pp. 19-27
Author(s):  
Wilfred R. Cuff ◽  
J.M. Hardman ◽  
M.K. Mukerji
Keyword(s):  
Technology Transfer ◽  
Case Studies ◽  
Sitophilus Oryzae ◽  
Effective Communication ◽  
General Analysis ◽  
Rice Weevil ◽  
Stored Wheat ◽  
Scientific Staff ◽  
Research Planning ◽  
Transfer Modelling

AbstractTwo research programs in support of the wheat industry provide insights into mechanisms that can be used in research planning and in technology transfer. Modelling was pivotal in both: in Australia since 1973 in efforts against rice weevil, Sitophilus oryzae L., infestations of stored wheat and in Canada since 1970 against grasshopper infestations of wheat fields. The research studies, described in published papers, were designed by the scientists within broad research objectives defined by the employing organizations. A mixture of technical and human considerations determined the direction of the research: the talents of scientific staff combined to capitalize on fortuitous events or situations. Serendipity improved the response to uncertainty in both research and industrial environments. The nature and amount of effort needed to get scientific insights applied varied with the specifics of the scientific insight. A general analysis of technology transfer suggests that, in some cases, application requires the involvement of a variety of nonscientific specialists and that research managers are well positioned to coordinate the efforts. Taken together, the conclusions show that satisfying a need or solving a problem is a task within which research is only one part. Success requires effective communication and compromises among very different people.

scholarly journals The First Evidence of the Insecticidal Potential of Plant Powders from Invasive Alien Plants against Rice Weevil under Laboratory Conditions

2020 ◽  
Vol 10 (21) ◽  
pp. 7828 ◽  
Author(s):  
Tanja Bohinc ◽  
Aleksander Horvat ◽  
Miha Ocvirk ◽  
Iztok Jože Košir ◽  
Ksenija Rutnik ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Norway Spruce ◽  
Invasive Plants ◽  
Diatomaceous Earth ◽  
Wood Ash ◽  
Alien Plants ◽  
Rice Weevil ◽  
Invasive Alien Plants ◽  
Spruce Wood ◽  
Insecticidal Efficacy

In a laboratory experiment, we studied the insecticidal effects of invasive alien plants on the rice weevil. The research was carried out in two parts. In the first part, we studied the insecticidal properties of seven different plant species, namely, Bohemian knotweed (Fallopia × bohemica), Japanese knotweed (Fallopia japonica), false indigo-bush (Amorpha fruticosa), tree of heaven (Ailanthus altissima), staghorn sumac (Rhus typhina), Canada goldenrod (Solidago canadensis), and giant goldenrod (Solidago gigantea). Mixtures of powders and wheat were prepared in two different concentrations, namely, 2.5 w% and 1.25 w%. The experiment was performed at temperatures 20 °C and 25 °C and at two humidity levels, 55% R.h. and 75% R.h. Very low mortality (below 8%) was found when using combinations with the higher relative humidity. No significant differences were observed between the effects of these concentrations. In the second part of the experiment, Norway spruce wood ash and diatomaceous earth (product SilicoSec®) were added to the powder obtained by milling leaves of four different invasive plant species (Canada goldenrod, staghorn sumac, tree of heaven, false indigo). In the independent application, wheat was added to the powder at a concentration 2.5 w%. In the treatments that involved mixtures of powder and wood ash/diatomaceous earth, we applied 1.25 w% plant powder and 1.25 w% wood ash or 1.25 w% plant powder and 450 ppm of a SilicoSec® preparation. The positive control was carried out as two separate treatments with 2.5 w% wood ash of Norway spruce and 900 ppm of the SilicoSec® product, while untreated wheat represented the negative control. The experiment was performed at two temperatures (20 °C and 25 °C) and two R.h. values (55 and 75% R.h.). The mortality of beetles was recorded on the 7th, 14th, and 21st day after the start of the experiment. Higher mortality rates of rice weevil adults were found at the higher relative humidity, and an important factor of mortality was also the day of exposure, as a higher mortality was found when the exposure of individuals to the tested substances was for a longer time period. After 21 days at 25 °C and 55% R.h., the combinations in which the lower concentration of Norway spruce wood ash was added to the powder of invasive alien plants achieved more than 90% mortality of beetles. By adding the plant powder of invasive alien plants to wood ash, we achieved a greater insecticidal efficacy of invasive plants and lower concentrations of wood ash. Nevertheless, the results of our research do not indicate any great usefulness of the plant powder of invasive plants in suppressing the rice weevil. Additional studies should primarily focus on the insecticidal efficacy of powder from the genus Solidago, which in our study, displayed the greatest insecticidal potential among the tested invasive plants.

scholarly journals Deterioration of Grain Quality of Wheat by Rice Weevil, Sitophilus oryzae (L.) during Storage

2021 ◽  
Author(s):  
Subash Singh ◽  
D.K. Sharma
Keyword(s):  
Durum Wheat ◽  
Sitophilus Oryzae ◽  
Biochemical Properties ◽  
Rice Weevil ◽  
Rhyzopertha Dominica ◽  
Wheat Cultivars ◽  
Storage Pests ◽  
Granary Weevil ◽  
Stored Wheat ◽  
Grain Damage

Background: A number of storage pests viz., Rhyzopertha dominica (F.), rice weevil, Sitophilus oryzae (L.), granary weevil, Sitophilus granarius (L.) and Khapra beetle, Trogoderma granarium (Evert.) damage stored wheat. However, S. oryzae is considered a primary pest of stored wheat and has been reported to prefer soft textured wheat cultivars.Methods: The grains of three bread (soft textured) viz., HD2967, PDW314, PBW658 and three durum wheat (hard textured) cultivars viz., WHD943, PBW621, PDW291 were screened for feeding response by rice weevil, Sitophilus oryzae L. in the laboratory. Each cultivar seed was properly cleaned and disinfested before its use. A 100g seed sample of each cultivar was taken into the plastic jars. Of the pure culture, ten 1-2 week young one insects (1:1 sex ratio) were released into the jars each containing different cultivar grains. The jars were covered with white muslin as three separate storage sets, i.e., 30, 60 and 90 days after storage to record data observations. Result: Durum wheat cultivars being low in protein contents were comparatively less preferred for pest feeding and cultivar PDW291 was found highly resistant based on low insect emergence, grain damage and weight loss. The bread wheat cultivars due to high protein contents were highly preferred by the pest and cultivar HD2967 showed maximum preference. The biochemical properties like ash contents and crude fibres showed positive while crude fats and protein a negative correlation with the pest infestation. 

scholarly journals Repellent Effect of the Caraway Carum carvi L. on the Rice Weevil Sitophilus oryzae L. (Coleoptera, Dryophthoridae)

Insects ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 836
Author(s):  
Małgorzata Kłyś ◽  
Aleksandra Izdebska ◽  
Natalia Malejky-Kłusek
Keyword(s):  
Relative Humidity ◽  
Essential Oil ◽  
Exposure Time ◽  
Plant Material ◽  
Laboratory Tests ◽  
Sitophilus Oryzae ◽  
Rice Weevil ◽  
Repellent Effect ◽  
Carum Carvi ◽  
Normal Relationship

The aim of the study was to check the effect of Carum carvi L. essential oil and L-carvone on the emigration, repellence and mortality of Sitophilus oryzae L. In the experiments with caraway essential oil, concentrations of 0.1%, 0.5% and 1% were used, and concentrations of 0.05, 0.1, 0.5 and 1% were used with L-carvone. We assessed whether, in what concentrations and after what exposure time the substances acted on S. oryzae as repellents and/or insecticides. The laboratory tests were carried out at 29 ± 1 °C with 60 ± 5% relative humidity (RH). The deterrence, mortality and abundance of insects were noted after 1, 2, 3, 4, 5, 24 and 48 h. For caraway essential oil and L-carvone, the highest repellency was not shown in the highest concentrations that were used in the tests but in the lower concentrations of 0.5% and 0.1%, respectively. In all used concentrations, caraway essential oil showed repellent effects on S. oryzae. The highest repellency (60–98%) was caused by 0.5% caraway essential oil after 1, 2, 3, 4 and 5 h of research and by 0.1% L-carvone (16–100%). The highest mortality of S. oryzae was caused by 0.5% caraway essential oil and 1% L-carvone. L-carvone at a concentration of 0.05% did not cause mortality in S. oryzae. In conclusion, the greatest repellent effects on S. oryzae were caused by lower doses of caraway essential oil and L-carvone. These compounds do not show the normal relationship described in the previous literature on warehouse pests, in which the repellency increased with increasing concentrations of the tested plant material.

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