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| Titel: |
Evaluation of Helicoverpa armigera Nucleopolyhedrovirus (HearNPV) for Control of Helicoverpa armigera (Lepidoptera: Noctuidae) on Citrus in South Africa |
| Auteur: |
Moore, Sean D. Pittaway, Timothy Bouwer, Gustav Fourie, Jeremy G. |
| Verschenen in: |
Biocontrol science and technology |
| Paginering: | Jaargang 14 (2004) nr. 3 pagina's 239-250 |
| Jaar: |
2004-05 |
| Inhoud: |
A concentration of 1.15×107 OBs/mL of HearNPV, sprayed using a knapsack, resulted in a 100% reduction in Helicoverpa armigera larval infestation within 7 days on tomato plants in a hot house environment. A 10-fold lower concentration, 1.15×106 OBs/mL, resulted in a 100% reduction within 16 days. These two concentrations reduced damage to tomatoes by 81 and 69%, respectively. In two field trials on navel oranges, the lower concentration and an additional even lower concentration of 7.26×105 OBs/mL, both resulted in a 100% reduction in H. armigera infestation within 14 days or longer. H. armigera damage to fruit was reduced by up to 84 and 75%, respectively, in the two trials. Rejection for export was reduced by 96 and 62%. This could imply a saving of US$339 per hectare compared to the untreated control. These results were better than those achieved with Bacillus thuringiensis and various standard chemical insecticides used in the same trials. Reasons for these results are discussed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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