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Accueil du site → Master → Kenya → 1991 → The relationship between the age of the plant food material and that of the locust schistocerca gregaria forskal and how age influences food preference palatability and performance in this locust

Kenyatta University (1991)

The relationship between the age of the plant food material and that of the locust schistocerca gregaria forskal and how age influences food preference palatability and performance in this locust

Kiarie, Wanjiku Martha

Titre : The relationship between the age of the plant food material and that of the locust schistocerca gregaria forskal and how age influences food preference palatability and performance in this locust

Auteur : Kiarie, Wanjiku Martha

Université de soutenance : Kenyatta University, Kenya

Grade : Master of Science MSc 1991

Résumé partiel
This work was carried out at the kenyatta university, zoology department nsectary from february 1991 . The objectives of this study were to find out ; 1 if the age of the plant food material influences its palatability and preference by th edesert locust schistocerca gregaria. 2 if the age of the locust S Gregaria influences its feeding activity in terms of food palatability and preference. 3 if the above relationships influence performance is S gregaria in tems of increases in body weight, fecundity and suvival. 4 how the C:N ration of the plant food materials influences food palatability and preference, hence performance in the locust S gregaria. Different ages of the desert locust (Schistocerca gregaria forskal were used. The main stages of deelopment of S. gregaria used included the hatchlings, the hoppers, the fledglings and the mature adults. Their feeding activity was studied in terms of food prefernce, palatability and performacne of five agricultural crops maize (Zea mays Linnaeus, Katumani variety, broad bean (Vicia faba Linnaeus, ’mwezi moja’ variety), sorghum (Sorghum bicolor Persoon, serena variety wheat (Triticum vulgare, Villars and green grams (Phaseolus mungo Linnaeus. The seeds of the five crops were obtained from the Kenya Seed Company situated near Globe cinema in Nairobi Kenya. Through preference studies,it was shown that S. gregaria shows food selection when presented with various plant food materials. Preference was shown to differ significantly (P<0.001) between species, with sorghm at the age of seven weeks being more preferred, followed by wheat, maize, bean and green grams respectively. The age of the plant food material was shown to influence its being chosen for food by S. gregaria. At the age of one week bean and gree grams were preferred to maize, sorghum and wheat but at the ages of three and seven weeks, the three graminoids become more preferred with sorghum being the most preferred.

Mots clés : Schistocerca gregaria / Desert locust USE Schistocerca gregaria / Locusts / Food / Maize / Broad bean USE Vicia faba / Vicia faba / Sorghum bicolor / Grain / Triticum vulgare / Green grams USE Phaseolus mungo / Phaseolus mungo / Beans

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