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Accueil du site → Doctorat → États-Unis → 2019 → ASSESSING MANAGEMENT STRATEGIES TO CONTROL MAJOR INSECT PESTS OF STORED SORGHUM GRAIN (NIGER)

West Texas A&M University (2019)

ASSESSING MANAGEMENT STRATEGIES TO CONTROL MAJOR INSECT PESTS OF STORED SORGHUM GRAIN (NIGER)

Abdou Kadi Kadi, Hame

Titre : ASSESSING MANAGEMENT STRATEGIES TO CONTROL MAJOR INSECT PESTS OF STORED SORGHUM GRAIN (NIGER)

Auteur : Abdou Kadi Kadi, Hame

Université de soutenance : West Texas A&M University

Grade : Doctor of Philosophy (PhD) 2019

Résumé partiel
Occurrence and diversity of insect pests of stored sorghum, Sorghum bicolor (L.) Moench, were monitored in Niger. Efficacy of botanicals was evaluated to control red flour beetle, Tribolium castaneum Herbst, in Niger and maize weevil, Sitophilus zeamais Motschulsky, in Texas. Hermetic storage methods to control insect pests were assessed in Niger. Cost-benefit analysis determined measures of project worth, Net Present Value and Benefit-Cost Ratio, for benefit from investing in hermetic storage methods. Monitoring by sieving 200 g of infested grain found means of 15 to 17 red flour beetles in three improved sorghum varieties. Three traps detected as many as 10 insect pests in storage facilities in Niger. A water bottle trap caught 60% of the storage species trapped by a ‘Dome’ Pheromone trap and 85% of the species in the sticky glue trap. Four botanicals were effective in controlling red flour beetles in sorghum grain in Niger. Means of 1.5-2.0 adults died with 0.0125 and 0.025 g of kernels of neem, Azadirachta indica A. Juss. African locust beans, Parkia biglobosa Jacq., hibiscus, Hibiscus sabdariffa L., and baobab pulp, Adansonia digitata L. were less effective after 7 days. The cumulative number of beetles dead was 3.2 at 35 days after infestation with 0.05 g of neem. Damage scores were low (1.3-2.6 on a 1-5 scale) for sorghum treated with ≥0.1 g of botanical powder compared to a 3.9 score for the check (not treated). With three botanicals assessed, less than 0.1 g of milkweed, Asclepias speciosa J. Torrey, killed 1.3-1.8 maize weevils by Day 2, while mesquite, Prosopis glandulosa J. Torrey, killed 1.5 adult by Day 4. Few adults (≤0.8) were killed by neem bark. Two to 2.3 weevils were killed by 0.1 and 0.2 g of neem and 2.0 were killed by 0.2 g of milkweed by Day 6. Neem bark acted slowly for 14 days and killed 2.0 maize weevil adults when grain was treated with 0.05 g of powder. The cumulative percentage (94 and 91) of dead red flour beetles was greatest with 0.2 g of milkweed or mesquite. With 0.1 g, mesquite killed 87.5% compared to milkweed (78%) and or bark (65.6%). Percent mortality of beetles (78%) was greatest on sorghum grain treated with 0.2 g of neem compared to 0.05 and 0.1 g that killed 62.5 and 66%. Percent corrected mortality was 75-93% when maize weevils were fed sorghum treated with milkweed or mesquite at >0.1 g. Percent corrected mortality was 86% with 0.1 g of mesquite. Neem at 0.2 g lessened the grain damage score by weevils to 25.5%. Any botanical at any dose reduced damage to less than the mean of 3.5 for the check

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Page publiée le 25 mai 2021