Paula-Moraes et al 2024, Environmental Entomology)
” data-image-caption=”
These maps show examples of northward migration of corn earworm moths (Helicoverpa zea). One sampled moth is shown on each panel, with the red circle indicating its collection location in southern Ontario. The scale on the right shows the probability (p-values) of the geographic origin of each sampled moth, with p-values above 0.5 and closer to 1 (yellow to green colors) being more likely sites of origin. (Image originally published in Paula-Moraes et al 2024, Environmental Entomology)
” data-medium-file=”https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?fit=325%2C102&ssl=1″ data-large-file=”https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?fit=1024%2C320&ssl=1″ class=”size-large wp-image-22430″ src=”https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=1024%2C320&ssl=1″ alt=”A series of six maps shows longitudinal data with colored intensity ranging from 0.00 to 1.00, indicating different migration values within North and Central America. Each map is labeled CAN followed by a different number (1, 2, 3, 4, 9, 10). A red dot is marked on each map.” width=”1024″ height=”320″ srcset=”https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=1024%2C320&ssl=1 1024w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=325%2C102&ssl=1 325w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=768%2C240&ssl=1 768w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=1536%2C480&ssl=1 1536w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=2048%2C640&ssl=1 2048w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?resize=1200%2C375&ssl=1 1200w, https://i0.wp.com/entomologytoday.org/wp-content/uploads/2024/06/corn-earworm-origin-maps.jpeg?w=3000&ssl=1 3000w” sizes=”(max-width: 1000px) 100vw, 1000px” data-recalc-dims=”1″/>These maps show examples of northward migration of corn earworm moths (Helicoverpa zea). One sampled moth is shown on each panel, with the red circle indicating its collection location in southern Ontario. The scale on the right shows the probability (p-values) of the geographic origin of each sampled moth, with p-values above 0.5 and closer to 1 (yellow to green colors) being more likely sites of origin. (Image originally published in Paula-Moraes et al 2024, Environmental Entomology)
In Minnesota, there are generally two migratory flight periods per year, one in June and then one in late July to early August. In the first flight period, moths migrate in from southern latitudes. In the second flight period, multiple flights occur among a mixture of migrant moths and local offspring of migrating moths from the first flight period. Therefore, the local moths sampled in Minnesota, which were collected in September, might have been young produced by migrant moths arriving in the warm months and not from moths that overwintered.
Samples in southern regions were not found to originate in northern regions. But they were sampled in July and August, so northern moths may not yet have reached these sampling areas.
The hydrogen-isotope-ratio measurements made by Paula-Moraes and colleagues suggest that corn earworms migrate south to north from Central America, the Caribbean, and the Southeastern U.S. to the Midwest and Canada as weather conditions improve with the advent of spring and summer. They also observed reverse migration of the moths, from north to south.
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Source link : https://entomologytoday.org/2024/06/05/corn-earworm-migration-hydrogen-isotope-improved-management/
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Publish date : 2024-06-05 11:15:50
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