Effect of uneven distribution of spinetoram-treated wheat and rice on mortality and progeny production of Rhyzopertha dominica (F.), Sitophilus oryzae (L.) and Tribolium confusum Jacquelin du Val

2012 ◽  
Vol 50 ◽  
pp. 73-80 ◽  
Author(s):  
Thomas N. Vassilakos ◽  
Christos G. Athanassiou
Keyword(s):  
Sitophilus Oryzae ◽  
Tribolium Confusum ◽  
Uneven Distribution ◽  
Rhyzopertha Dominica ◽  
Progeny Production

scholarly journals Efficacy of Combinations of Methoprene and Deltamethrin as Long-Term Commodity Protectants

Insects ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 50 ◽  
Author(s):  
Frank H. Arthur
Keyword(s):  
Weight Loss ◽  
Sitophilus Oryzae ◽  
Brown Rice ◽  
The United States ◽  
Rhyzopertha Dominica ◽  
Insect Damage ◽  
Ambient Conditions ◽  
Progeny Production ◽  
Grain Damage ◽  
Sample Weight Loss

Wheat, corn, and brown rice were treated with different combinations of a deltamethrin suspension concentrate (SC) formulation and a new emulsifiable concentrate (EC) formulation, at rates of either 0.5 or 1.0 ppm alone or in combination with 1.25 and 2.5 ppm methoprene (10 treatments in all, including an untreated control). Treated commodities were stored at ambient conditions on the floor of an empty grain bin in Manhattan, KS, USA, in 5-kg lots for individual replicates. The commodities were sampled and bio-assayed every three months for 15 months by exposing 10 mixed-sex parental adults of selected adult stored product insects on 70–80 g of the commodity. For all treatments, there was no regression of declining efficacy with respect to the month. Therefore, the data were combined for analysis. On wheat and brown rice, there was no reproduction of Rhyzopertha dominica (Fabricius) in any of the treatments, and there was no weight loss in either commodity that was caused by feeding of the parental adults or developing progeny. There was reproduction of Sitophilus oryzae (L.) on wheat but, for several combinations, the EC formulation gave better suppression of progeny compared to the standard SC. However, on brown rice, only the combination of 1.0 ppm deltamethrin EC and 2.5 ppm methoprene was different than other treatments with respect to progeny development, sample weight loss caused by feeding, and weight of the feeding damage itself. Progeny production was correlated with grain damage. No progeny of Tribolium castaneum (Herbst) developed on the treated corn, but there was some variation in insect damage, with less damage in those treatments involving the EC formulation. Progeny production of Sitophilus zeamais (Motschulsky) was at the lowest in the combination of 1.0 ppm deltamethrin EC and 2.5 ppm methoprene. The resulting insect damage was the lowest in this combination as well. Results of this study were used by the registrant (Central Life Sciences) in the United States (US) to modify the commercial formulation to replace the deltamethrin SC with the EC, at label rates of either 0.5 ppm EC+ 1.25 ppm methoprene, or 1.0 ppm EC + 2.5 ppm methoprene, on wheat, corn, and rice.

Susceptibility of Twelve Genotypes of Triticale to the Rice Weevil (Coleoptera: Curculionidae) and the Lesser Grain Borer (Coleoptera: Bostrichidae)2

1991 ◽  
Vol 26 (3) ◽  
pp. 339-344 ◽  
Author(s):  
J. E. Baker ◽  
F. H. Arthur ◽  
P. L. Bruckner
Keyword(s):  
Moisture Content ◽  
Growth Parameters ◽  
Oryza Sativa L ◽  
Sitophilus Oryzae ◽  
Brown Rice ◽  
Rice Weevil ◽  
Rhyzopertha Dominica ◽  
Progeny Production ◽  
Lesser Grain Borer ◽  
Total Progeny

Population development by the rice weevil, Sitophilus oryzae (L.) and feeding damage caused by the lesser grain borer, Rhyzopertha dominica (F.), were assessed on twelve triticale (X Triticosecale Wittmack) genotypes maintained at 25°C and at 11.7 or 14.2% moisture content. Among genotypes at 14.2% moisture content, total progeny production by the rice weevil ranged from 7.1 (GA82014) to 8.8 (87AB13541) weevils per female-day; mean time to adult emergence ranged from 35.5 (GA82014) to 36.9 days (87AB13541 and CT4699); and rate of emergence (a measure of the slope of the cumulative emergence curve at the average emergence day) ranged from 0.59 (87AB 13541) to 0.72 (‘Morrison’). Although there were some statistical differences among these population growth parameters on different triticale genotypes, all genotypes were at least as susceptible as the long grain brown rice (Oryza sativa L.) and soft red winter wheat (Triticum aestivum L., cultivar ‘Florida 302’) controls tested concurrently. Development time of rice weevils was significantly delayed and total progeny production after 65 days was reduced about 17-fold on triticale genotypes at 11.7% moisture content. About 3-fold more frass was produced by lesser grain borers feeding for 7 days at 25°C on triticale genotypes at 14.2% moisture content compared to that obtained on genotypes at 11.7% moisture content. Significantly more feeding and frass production by lesser grain borers occurred on triticale and wheat than occurred on rice.

Effect of Two Azadirachtin Formulations against Adults of Sitophilus oryzae and Tribolium confusum on Different Grain Commodities

2007 ◽  
Vol 70 (7) ◽  
pp. 1627-1632 ◽  
Author(s):  
NICKOLAS G. KAVALLIERATOS ◽  
CHRISTOS G. ATHANASSIOU ◽  
CONSTANTIN J. SAITANIS ◽  
DEMETRIUS C. KONTODIMAS ◽  
ALEXANDER N. ROUSSOS ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Abiotic Factors ◽  
Sitophilus Oryzae ◽  
Adult Mortality ◽  
Tribolium Confusum ◽  
Progeny Production ◽  
Stored Grain ◽  
Insecticidal Effect ◽  
Grain Beetles ◽  
Dosage Formulation

The insecticidal effect of two azadirachtin-based insecticides, NeemAzal-T/S and Oikos 32 EC, was examined against adults of the grain beetles Sitophilus oryzae and Tribolium confusum on wheat and maize under different temperature and humidity regimes. The insecticides were applied at three dosages, equivalent to 50, 100, and 200 mg of active ingredient per kg of grain. Adults of the above species were exposed to the treated grains at 20, 25, and 30°C and two relative humidity levels (55 and 75%), and mortality was assessed after 14 days of exposure. All adults were then removed, and the treated substrate remained under the same conditions for 45 more days. After this period, the grains were checked for progeny production. In both species and both commodities, mortality increased with insecticide dosage. For many dosage-formulation combinations, mortality increased with temperature at 55% relative humidity but the reverse was observed at 75% relative humidity. Comparing the two formulations, NeemAzal-T/S was more effective than Oikos 32 EC at all the combinations tested. NeemAzal-T/S was more effective at high relative humidity, but the efficacy of Oikos 32 EC was not much affected by the relative humidity. Survival was high, even at the higher dosages, in some of the temperature-humidity combinations. Progeny production of S. oryzae in the treated grains was considerably higher than that of T. confusum. The results of the present study indicate that further dosage increases and longer exposure times are needed to obtain a complete (100%) adult mortality in all combinations tested. However, the feasibility of using higher azadirachtin dosages (>200 mg/kg grain) is questionable for cost reasons. Consequently, the use of these substances is not comparable to the use of traditional grain protectants, which are usually used at dosages of <5 mg/kg grain. Although azadirachtin-based insecticides can be used with success for protection of stored grain, our study demonstrated that under certain circumstances such an application may not be effective. Abiotic factors (formulation, temperature, and relative humidity) had a more serious impact on the efficacy of these insecticides than did biotic factors (target species and commodity).

Abiotic and Biotic Factors Affect Efficacy of Chlorfenapyr for Control of Stored-Product Insect Pests

2011 ◽  
Vol 74 (8) ◽  
pp. 1288-1299 ◽  
Author(s):  
NICKOLAS G. KAVALLIERATOS ◽  
CHRISTOS G. ATHANASSIOU ◽  
ANN N. HATZIKONSTANTINOU ◽  
HELEN N. KAVALLIERATOU
Keyword(s):  
Insect Pests ◽  
Sitophilus Oryzae ◽  
Adult Emergence ◽  
Paddy Rice ◽  
The Other ◽  
Rhyzopertha Dominica ◽  
Prostephanus Truncatus ◽  
Progeny Production ◽  
Abiotic And Biotic Factors ◽  
Grain Protectant

Laboratory bioassays were conducted to assess pyrole chlorfenapyr as a potential grain protectant against adults of Rhyzopertha dominica, Sitophilus oryzae, Prostephanus truncatus, Tribolium confusum, and Liposcelis bostrychophila. Factors such as dose (0.01, 0.1, 0.5, 1, 5, and 10 ppm), exposure interval (7 and 14 days), temperature (20, 25, and 30°C), relative humidity (RH; 55 and 75%), and commodity (wheat, maize, barley, and paddy rice) were evaluated. Progeny production was assessed after 74 days of exposure. For L. bostrychophila and T. confusum the increase of dose increased mortality. After 7 or 14 days of exposure, mortality was low at doses of ≤1 ppm and did not exceed 23 or 36%, respectively, for L. bostrychophila or 13 or 58%, respectively, for T. confusum. After 14 days of exposure, mortality of S. oryzae at 30°C and 75% RH was 82.2%. Mortality of P. truncatus was considerably higher than that of the other species. At 0.5 ppm, mortality exceeded 81% after 7 days of exposure and 91% after 14 days of exposure. Progeny production of L. bostrychophila was extremely high. Very few progeny were found for T. confusum. For S. oryzae, offspring emergence was high, except at 20°C and 55% RH. For P. truncatus, progeny production in the treated maize was not avoided, even at 10 ppm. In the case of S. oryzae, at 0.1 ppm and after 14 days of exposure, mortality in wheat was higher than in the other three commodities. For R. dominica, mortality was low at 0.1 and 1 ppm for paddy rice but reached 74.4% in barley after 14 days of exposure. For T. confusum, mortality was low at 0.1 and 1 ppm in all commodities. For progeny production counts, for S. oryzae or R. dominica, adult emergence was higher in paddy rice than in the other three commodities. Finally, overall T. confusum progeny was low. Chlorfenapyr efficacy varied remarkably among the combinations tested, and it may be a viable grain protectant in combination with other insecticides.

scholarly journals Insecticidal effect of from three Hypericum species extracts against Rhyzopertha dominica, Sitophilus oryzae and Tribolium confusum

2021 ◽  
Vol 45 ◽  
Author(s):  
Cennet Yaman ◽  
Şeyda Şimşek
Keyword(s):  
Insect Pests ◽  
Sitophilus Oryzae ◽  
Tribolium Confusum ◽  
Rhyzopertha Dominica ◽  
Botanical Insecticides ◽  
Stored Grain ◽  
Leaf Extracts ◽  
Insecticidal Effect ◽  
Hypericum Species ◽  
Control Insect

ABSTRACT The search for new plant natural products with insecticidal properties to control insect pests in agriculture has gained relevance in the past decades. The aim of the study was to investigate the insecticidal activity of extracts derived from flower, leaf, and stem of three Hypericum species (Hypericum heterophyllum, Hypericum perforatum, Hypericum scabrum) against the adults of three important stored grain insect pests namely; Sitophilus oryzae (Curculionidae), Rhyzopertha dominica (Bostrichidae) and Tribolium confusum (Tenebrionidae). The insects were incubated with the food under 10% concentration of Hypericum extracts and the mortality was recorded after 24, 48 and 72 h of exposure. The extracts of the Hypericum species and exposure time were found to have statistically significant effective against the three insect pests. After 72 h exposure, the mortality ranged from 4.3 to 94.1 % for all insects. Among tested insects, R. dominica was more susceptible than T. confusum and S. oryzae. Although desirable insecticidal effect against the insects were recorded from all the three Hypericum species, the leaf extract of H. perforatum was more effective on R. dominica, while the flower and stem of H. scabrum displayed high toxic effect on T. confusum and S. oryzae, respectively. The leaf extracts, of H. perforatum, in particular, may be used as source of new potential botanical insecticides against R. dominica in stored grains.

scholarly journals Determinação de concentrações de Beauveria bassiana (Bals.) Vuill. para o controle de insetos-pragas de grãos armazenados

1997 ◽  
Vol 26 (1) ◽  
pp. 15-20 ◽  
Author(s):  
Alcides Moino Jr. ◽  
Sérgio B. Alves
Keyword(s):  
Beauveria Bassiana ◽  
Sitophilus Oryzae ◽  
Rhyzopertha Dominica

Determinou-se a suscetibilidade de Sitophilus oryzae (L.), S. zeamais (Motsch.) e Rhyzopertha dominica (Fabr.) a dois isolados do fungo Beauveria bassiana (Bals.) Vuill. Para isso foram usados recipientes contendo arroz beneficiado, inoculado previamente com conídios dos isolados, infestados com as três espécies de insetos. Esses recipientes foram mantidos a 26 ± 0,5°C, 70 ± 10% de UR e fotofase de 12 horas. As três espécies foram suscetíveis aos dois isolados do patógeno. Os dois isolados foram eficientes para o controle de S. oryzae, na concentração de 0,5 g de conídios/100 g de grãos. Para S. zeamais, o isolado 604 foi mais eficiente na concentração de 0,1 g de conídios/100 g de grãos. Com relação a R. dominica, foram suficientes dosagens de 0,01 g (isolado 476) e 0,05 g (isolado 604)/100 g de grãos, confirmando a maior suscetibilidade desta espécie ao patógeno.

Sign in / Sign up

Export Citation Format

Share Document