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Justus-Liebig Universität Giessen (2001)

The use of neem products for sustainable management of homopterous key pests on potato and eggplant in the Sudan

El-Shafie, Hamadttu Abdel-Farag

Titre : The use of neem products for sustainable management of homopterous key pests on potato and eggplant in the Sudan

Auteur : El-Shafie, Hamadttu Abdel-Farag

Université de soutenance : Justus-Liebig Universität Giessen

Grade : Doctor in Agriculture (Dr. agr.) 2001

Résumé
The work was carried out to evaluate the potentialities of neem products as home-made and commercial insecticides in the management of three homopterous key pests : Jacobiasca lybica (de Berg), Bemisia tabaci (Gennadius) and Aphis gossypii Glover on potato (Solanum tuberosum) and eggplant (Solanum melongena). Under laboratory conditions, NeemAzal-T/S and neem oil resulted in a mean mortality of 97.5 ± 2.9%, 95.7 ± 3.8% and 91.8 ± 4.2 % respectively on the 2nd and 3rd larval stages (L2 & L3) of the greenhouse whitefly. The adult stage seems to be less affected by the neem products (10.5 ± 1.4 % and 18.4 ± 1.8 % mortality for NeemAzal-T/S and neem oil respectively) compared with 100 ± 0.0 % mortality for Imidacloprid. NeemAzal-T/S, neem oil and Folimat resulted in a mean percent mortality of 91.88 ± 3.50, 90.36 ± 2.95 and 100 ± 0.00 % respectively on the 2nd nymphal stage of the cotton jassid in greenhouse experiment, while a mortality of 78.13 ± 3.95, 59.38 ± 2.71 and 93.75 ± 2.58 % was obtained on the 3rd nymphal instar by application of the above mentioned formulations, respectively, on potted potato plants. In the field cages, the potato crop could not withstand a level of jassid infestation above 40 insects/100 leaves. Under field conditions, 200 jassids/100 leaves was the critical level for the initiation of practical control. The NeemAzal-T/S proved to be more or less similar to Sumicidin in its performance profile under field conditions. Its application with ULVA+ sprayer resulted in an increase of potato yield by 35.48 and 65.00 dt/ha in the winter seasons of 1998/99 and 1999/2000 respectively, compared with Sumicidin which has increased yield by 41.42 and 71.19 dt/ha simultaneously in the two seasons of study. No significant difference was observed in the performance of the two products. Their effectiveness was also more or less the same on eggplant, where an increase in yield of 129.52 and 121.67 dt/ha was obtained when the crop was sprayed with NeemAzal-T/S and Sumicidin, respectively, in the winter season of 1998/99. The same trend was obtained in the following growing season of 1999/2000 where the application of NeemAzal-T/S resulted in an increase of yield of 145.48 dt/ha while Sumicidin accounted for 143.10 dt/ha. The possible implementation of the results obtained into system of Integrated Pest Management under the specific Sudanese conditions is discussed.

Mots clés : Sudan  ; Kartoffelbau ; Nimprodukt ; Biologische Schädlingsbekämpfung

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Page publiée le 19 mars 2008, mise à jour le 8 janvier 2019