Evaluation on the efficacy of spinosad dust against major storage insect pests.

Mutambuki, Kimondo; Ngatia, C. M.; Mbugua, J. N.; Likhayo, Paddy; Credland, P. F.; Armitage, D. M.; Bell, C. H.; Cogan, P. M.; Highley, E.

doi:10.1079/9780851996912.0888

Cited by 12 publications

(15 citation statements)

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“…Similarly, Mutambuki et al (2003) noted that P. truncatus was also very susceptible to dry spinosad. According to Athanassiou et al (2008b), P. truncatus was proved very susceptible to liquid spinosad, at dose rates as low as 0.1 ppm.…”

Section: Discussionmentioning

confidence: 94%

“…However, most of the available data concern the application of liquid spinosad formulations, while there is a paucity of information on the use of dry (dust) spinosad. Mutambuki et al (2003) reported that spinosad dust was effective in maize against Prostephanus truncatus (Horn), Sitophilus zeamais Motschulsky and Tribolium castaneum (Herbst).…”

Section: Introductionmentioning

confidence: 98%

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Influence of commodity on the effect of spinosad dust againstRhyzopertha dominica(F.) (Coleoptera: Bostrychidae) andSitophilus oryzae(L.) (Coleoptera: Curculionidae)

Chintzoglou

Athanassiou

Markoglou

et al. 2008

International Journal of Pest Management

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We undertook laboratory bioassays to evaluate the insecticidal effect of spinosad dust against two major stored-grain beetle species, Rhyzopertha dominica (F.) and Sitophilus oryzae (L.), in wheat, barley and maize. Spinosad was applied at four dose rates: 20, 100, 500 and 1000 ppm of the formulation, corresponding to 0.025, 0.125, 0.625 and 1.25 ppm of active ingredient, respectively. Adult mortality was measured after 7 and 14 days of exposure in the treated substrate, while progeny production was assessed after the removal of the parental adults. For R. dominica, adult mortality was high and reached 100% at doses 0.125 ppm of a.i. after 14 days of exposure. In contrast, mortality of S. oryzae adults was 495% after 14 days of exposure only at 1.25 ppm of a.i. With the same exposure interval, no significant differences were noted in R. dominica mortality levels among the three grains tested, while mortality of S. oryzae was significantly higher on wheat than on barley and maize. More adult progeny were recorded for S. oryzae than for R. dominica. A simple and reliable method using high-performance liquid chromatography/mass spectrometry method (LC/MS) was developed for the precise and selective quantitative determination of spinosyns residues in wheat, barley and maize grains. Spinosad dissipation on different commodities such as maize, barley and wheat differed significantly. Accelerated degradation of spinosad was observed in maize grains 14 days after application; the concentration of spinosad was slightly decreased in barley, but in the case of wheat a negligible degradation of spinosad was observed. These findings suggest that the reduced mortality of S. oryzae in maize is probably due to the high degree of pesticide degradation.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

Influence of commodity on the effect of spinosad dust againstRhyzopertha dominica(F.) (Coleoptera: Bostrychidae) andSitophilus oryzae(L.) (Coleoptera: Curculionidae)

Chintzoglou

Athanassiou

Markoglou

et al. 2008

International Journal of Pest Management

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“…truncatus to spinosad. Mutambuki et al ( 2003 ) tested spinosad against P . truncatus in semi-field tests in Kenya.…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature and Humidity on the Efficacy of Spinosad Against Four Stored-Grain Beetle Species

Athanassiou

Kavallieratos

Yiatilis

et al. 2008

Journal of Insect Science

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In the present work, we examined the insecticidal effect of spinosad, against adults of the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae), the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), the confused flour beetle, Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae) on wheat and the larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrychidae) on maize. The dose rates used were 0.01, 0.1, 0.5 and 1 ppm. The bioassays were carried out at three temperatures, 20, 25 and 30°C and two relative humidity levels, 55 and 75%. Mortality of R. dominica and S. oryzae was high even at 0.01 ppm of spinosad, reaching 100% at 55% relative humidity and 30° after 21 days of exposure. Generally, mortality of R. dominica, increased with temperature while for S. oryzae mortality increased with temperature and with the decrease of relative humidity. Moreover, for S. oryzae, mortality was low at 20°C. In the case of T. confusum, mortality was low at doses between 0.01 and 0.5 ppm even after 21 days of exposure. At 1 ppm, mortality exceeded 90% only at 30°C and only after 21 days of exposure. Mortality of P. truncatus was low on maize treated with 0.01 ppm, but increasing the dose to 0.1 ppm resulted in > 87% mortality after 14 days of exposure. In several combinations tested, spinosad efficacy notably varied according to the temperature and humidity regimes. Of the species tested, R. dominica and P. truncatus were very susceptible to spinosad, followed by S. oryzae, while T. confusum was the least susceptible.

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“…Spintor ® is a 0.125% spinosad dust formulation that was first registered in Kenya in 2003 as a grain protectant (Mutambuki et al, 2012) and has since been registered in more than 15 African countries for domestic use only, with no export of Spintor ® treated grain (Hertlein et al, 2011). Maize cob and red haricot bean trash (remains of the plant after seed has been threshed) were separately burned on sheet metal and then passed across a sieve of 1 mm aperture size to obtain dust with uniform particle size.…”

Section: Grain Protectantsmentioning

confidence: 99%

Effect of grain moisture content and storage time on efficacy of inert and botanical dusts for the control of Sitophilus zeamais in stored maize

Khakame¹

2012

J. Stored Prod. Postharvest Res.

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The effect of grain moisture content and time of storage on the efficacy of inert and botanical dusts, conventional and bacterial metabolite insectcides were evaluated in the laboratory. Maize grains at 10, 12, 14 and 16% moisture content were admixed with inert powder (diatomaceous earth Kensil Superfine®), maize cob and bean trash ashes, and botanical (neem seed cake powder) at a dose rate of 0.9% w/w. Actellic Super® and Spintor® dusts applied at the recommended rate of 50 g/90 kg grain and diatomaceous earth Dryacide® at 0.9% w/w were included as positive controls. Untreated maize grain served as the negative control. Thirty (30) unsexed two-week-old Sitophilus zeamais Motsch. adults were introduced in the treated maize. The treatments were replicated four times and held undisturbed for 14 days at ambient conditions (26 ± 2°C and 67 ± 3% r.h.), after which mortality was assessed. Results showed that grain moisture content significantly (p<0.05) affected efficacy of grain protectants and superior control was achieved when it did not exceed 12% for inert dusts and 14% for pesticides. For the evaluation of the effect of time of storage, 4 kg maize grain were admixed with each treatment except for Spintor® dust, maize cob ash, neem seed cake powder as described earlier and put into the 5 kg capacity hessian baglets, replicated four times. Untreated grain acted as the control. Adult S. zeamais (population of 1500) were put in the plastic Petri dish and left to infest the baglets naturally. The potency of the protectants began to wane significantly (p<0.05) after 6 months. Dryacide ® followed by Kensil Superfine® dusts performed better than Actellic Super® with the grain weight loss of 2 and 4%, respectively, over a period of 9 months. The study demonstrates that Superfine ® dust has the potential but should be further evaluated on-farm, for the control of storage insect pests and serve as another stored products protectant option.

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Evaluation on the efficacy of spinosad dust against major storage insect pests.

Cited by 12 publications

References 0 publications

Influence of commodity on the effect of spinosad dust againstRhyzopertha dominica(F.) (Coleoptera: Bostrychidae) andSitophilus oryzae(L.) (Coleoptera: Curculionidae)

Influence of commodity on the effect of spinosad dust againstRhyzopertha dominica(F.) (Coleoptera: Bostrychidae) andSitophilus oryzae(L.) (Coleoptera: Curculionidae)

Influence of Temperature and Humidity on the Efficacy of Spinosad Against Four Stored-Grain Beetle Species

Effect of grain moisture content and storage time on efficacy of inert and botanical dusts for the control of Sitophilus zeamais in stored maize

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