Dose transfer of an oilbased formulation of Metarhizium anisopliae (Hypocreales: Clavicipitaceae) sprays to cotton bollworm in an arena trial
A cotton field was used to set up an arena trial for investigating the dose transfer of oil-based ultra-low-volume sprays of Metarhizium anisopliae (Metchnikoff) Sorokin to the cotton bollworm Helicoverpa armigera (Hübner). Two doses of conidia (75 and 50 g/ha, being 3.75 × 1012 and 2.5 × 1012 conidia/ha, respectively) formulated in 2 litres (70:30, kerosene–peanut oil) were applied using a Berthoud ‘Micro Ulva’ to three groups of larvae of cotton bollworms positioned in three rows downwind of a single spray line. Both the distribution of the droplets and the effect of direct contact with spray droplets were quantified. The mean number of droplets decreased from 416 ( ± 60) droplets per cm2 (line 1; 0.4 m) to 45 ( ± 36) droplets per cm2 (line 3; 5 m). To achieve 50% mortality, >10 and >13 days were necessary for 75 and 50 g/ha, respectively. From day 15, the difference in mortality rates was significant between the two treatments. At line 3 (5 m), at 12 days after application, the mortality rate reached 52% for 75 g/ha and 47% for 50 g/ha. The results are discussed in view of optimizing the application of the biopesticides.
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article biblioteca |
| Language: | English |
| Published: |
2011
|
| Subjects: | helicoverpa armigera, metarhizium anisopliae, biopesticides, ultralow volume spraying, |
| Online Access: | https://hdl.handle.net/10568/88176 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|