Invasive Species Compendium

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Abstract

Estimate of cotton production losses caused by pests in Chad.

Abstract

Cotton production losses caused by pests (including Helicoverpa armigera, Diparopsis watersi, Pectinophora gossypiella and Earias spp.) were assessed at 2 experimental stations in Chad using plots with different levels of phytosanitary protection under excellent cultural conditions. The average production loss with no insecticidal protection was estimated to be 50% of the potential production. No correlation was noted between the annual levels of larvae of the main pests and production losses. A regression model was designed to estimate the gain resulting from the recommended programme: the parameters were sowing date and the types of products applied. An average of 75% of potential production can be achieved by application of the recommended treatment programme. However, the results for on-farm conditions may be different.