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Insecticidal efficacy of diatomaceous earth against Sitophilus zeamais Motschulsky ( Coleoptera : Curculionidae ) on stored maize in Thailand
| Content Provider | Semantic Scholar |
|---|---|
| Author | Noosidum |
| Copyright Year | 2015 |
| Abstract | The insecticidal and residual effects of diatomaceous earth (DE) against Sitophilus zeamais Motschulsky, the maize weevil, on stored maize were evaluated in a laboratory. Adults were exposed on maize treated with DE (CUT ‘N DRY TM ) at five dose rates: 0, 250, 500, 1,000 and 1,500 ppm and compared to fenitrothion 50% EC at 10 ppm. Exposures were done immediately ater treatment and after one, two and three months. The results showed that dose rates and application time significantly affected weevil mortality (P<0.05). All fenitrothion treatments showed 100% mortality of S. zeamais adults whereas mortality rates of control treatments (0 ppm) were lower than 2.26%. Mortalities form the same dose rate of DE treatments were constant at longer post-application period intervals. At 250 and 500 ppm of DE mortality was only 3.75-40.25% whereas at 1,000 and 1,500 ppm of DE mortality was 43.25-88.50%. Mortality rates at 250 and 500 ppm of DE immediately, one, two and three months post-application were lower than 40.25% while at 1,000 and 1,500 ppm of DE mortality was 77.00-88.50%, except for 1,000 and 1,500 ppm of DE at one month postapplication (43.25-57.00%). No progeny were found in fenetrithion treatments. Progeny ranged from 122-139 at the 250 and 500 ppm DE treatments and 48-116 and 51-123 individuals at the 1,000 and 1,500 ppm, treatments. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://spiru.cgahr.ksu.edu/proj/iwcspp/pdf2/11/122.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
