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Earth observation satellites can be used for determining land use and associated changes over time, soil mapping, crop yields and pest damage. Grass grub (Costelytra zealandica) is widespread across New Zealand with high larval populations causing significant pasture losses. The feasibility of using satellite remote sensing to assist grass grub damage mapping was investigated. Images of Canterbury taken by Landsat 5 and Quickbird 2 were compared to photographs taken from a light aircraft flying over grass grub infested pasture. Coverage per pass and altitude were 85 km and 780 km for Landsat 5 and 6 km and 450 km for Quickbird 2, respectively. However, Quickbird 2 has a multispectral band resolution of 2.5 m (30 m for Landsat 5), giving a better image at the paddock scale for identifying grass grub damage, which compared well with aircraft-acquired photographs. Challenges associated with satellite imagery include excessive cloud cover, sun angle in relation to season, calibration of satellite image to pest damage, the ability to obtain near real-time images and the requirement to task the satellite to acquire images over a particular area. A government backed initiative to use high-medium resolution (2.50 m) satellite services to systematically collect images of the country offers further opportunity to use satellites for insect and disease detection.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Investigating the cause of localised dry spots and pasture damage in Hawkes Bay hill country Are mealybug <i>Balanococcus poae/Rhizoecus</i> spp or root aphid <i>Aploneura lentisci</i> implicated

Investigating the cause of localised dry spots and pasture damage in Hawkes Bay hill country Are mealybug Balanococcus poae/Rhizoecus spp or root aphid Aploneura lentisci implicated