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Articles by Waktole Sori
Total Records ( 9 ) for Waktole Sori
  Worku Wolde , Emana Getu and Waktole Sori
  Sweet Potato Weevil (SPW) (Cylas puncticollis) (B.) is a destructive pest of sweet potato in Ethiopia. It causes severe damage to the tuber and infested tuber further produce bitter taste becoming unsuitable for human consumption and animal feed. This problem calls for C. puncticollis effective control measure (s). An experiment was carried out with the aim to identify effective control tools by integrating two cultural practices (Earthing-up and harvesting time). Sweet potato variety, Awassa-83, a moderately resistant variety to C. puncticollis was used for the study. Two factors: Earthing-up with four levels (no, 1x, 2x, 3x and no earthing-up) and harvesting time with three levels (prompt harvesting, one and two months delayed harvesting) making up 12 treatment combinations were tested. These treatment combinations were laid-out in a Randomized Complete Block Design (RCBD) with three replications. Marketable and unmarketable yield (t ha-1), sweet potato damaged tubers, yield loss, percent damage and weevil density were assessed. The result obtained indicated that combination of three times earthing-up and prompt harvesting significantly reduced number of damaged tubers (25 plot-1), SPW density (29.77 plot-1), damage percentage (6.9% plot-1), unmarketable yield (0.56 t h-1) and yield loss (8.68%). These demonstrate the effectiveness of frequent earthing-up and prompt harvesting for management of SPW. Hence, integrated use of resistant variety, prompt harvesting and three times earthing-up can be recommended for the management of SPW in southern Ethiopia.
  Tarekegn Fite , Emana Getu and Waktole Sori
  Field experiment was conducted with an objectives to estimate losses caused to sweetpotato due to Cylas puncticollis damage and devise integrated management options for the pest in eastern Ethiopia. The study was conducted at Haramaya University in eastern Ethiopia during the rainy season (June-Nov.) of 2011. The experiment was laid-out in Randomized Complete Block Design (RCBD) with three replications in a factorial arrangement. The factors were; three levels of cropping systems (sole sweetpotato (as control), sweetpotato intercropped with maize and sweetpotato intercropped with haricot bean), three levels of earthing-up (1x, 2x and 3x) and two levels of harvesting periods (prompt and 1 month delayed harvesting). Data collected were number of damaged and health storage roots, weight of healthy and damaged roots and yield of maize and haricot bean. These data were analyzed using SAS version 9.2 and means were separated using Least Significant Differences (LSD). Results of the studies suggested that the three way interaction effect was highly significant (p<0.01). Sweetpotato intercropping with maize, three times earthing-up and prompt harvesting has reduced percentage weight loss from 68.28 to 8.46% and yield loss from 70 to 22.26%. The highest (1.53) Land Equivalent Ratio (LER) was obtained from sweetpotato-haricot bean intercropping followed by sweetpotato-maize (1.28) cropping system. Similarly, cost-benefit analysis showed sweetpotato intercropped with haricot bean resulted in high economic profit than sweetpotato intercropped with maize and monoculture. Therefore, integrated use of the three cultural practices favorably reduced weevil’s impact on sweetpotato and resulted with higher economic benefit. Hence, sweetpotato farmers are advised to use these eco-friendly economical tools in area where C. puncticollis is economically important insect pests of sweetpotato.
  Daba Mengesha , Derbew Belew , Wosene Gebreselassie and Waktole Sori
  Among the major root and tuber crops, anchote is a potential crop produced in West Wollega zone of Ethiopia. It serves as a food, cultural, social and economical crop for the farming communities. Due to the lower attention given to the research and development of anchote, there is no variety so far developed and released. Ten promising anchote accessions were tested at Jimma and Ebantu from June 2010 until October 2010 to determine agronomic performance of the accessions. The experimental design was a randomized complete block design with three replications. The results indicated that yield and yield components were significantly (p<0.05) higher for the majority of the accessions under Ebantu than Jimma condition. The highest total biomass, 19.13 kg per 4 m2 plot, was obtained at Ebantu from accession 223098 while the maximum total biomass at Jimma was only 11.69 kg per 4 m2 plot that was obtained from accession 223087. Almost all accessions took longer average time (128 days) to reach 90% maturity under Ebantu condition than Jimma which took 109 days on average. The maximum storage root yield (76.45 t ha-1) was observed for an accession No. 223098, under Ebantu condition, while, the lowest yield was obtained from accession No. 240407 (51.54 t ha-1) under Jimma condition. The highest mean dry matter (30%) was obtained under Ebantu condition for almost all accessions. On the other hand, the lowest mean dry matter (20%) was obtained under Jimma condition. From this study the six accessions 223109, 223087, 223098, 223096, 90802 and 229702 produced better storage root yield, high dry matter content, high biological yield across the two environments indicating a good performance and adaptation. Therefore, these accessions are suggested to farmers in areas of Jimma, Ebantu and with other areas of similar agro-ecological zones.
  Addisu Sileshi , Waktole Sori and Mohamed Dawd
  Termites, Macrotermes are major agricultural and domestic problem in Ethiopia causing serious damage with loss up to 100%. The use of synthetic termitecids was the most commonly used prevention measure to reduce the termites attack. However, these synthetic termiticides were known to be very harmful to the environment and non-target organisms. Therefore, efficacy of entompathogenic fungi, Metarhizium anisopliae (isolates PPRC-2 and MM) and Beauveria bassiana (isolates PPRC-56 and 9609) were evaluated against Macrotermes. The isolates were obtained from Ambo Plant Protection Research Center, Ethiopia. For each isolate concentrations of 1x105 to 1x109 conidia mL-1 were prepared and used as treatments. Untreated and standard (Diazinon 60% EC) checks were used for comparison. The treatments were laid out in Completely Randomized Design (CRD) and replicated thrice. The fungal isolates were evaluated by direct spraying of spore suspensions on worker Macrotermes spp. The result of the study revealed that all fungal isolates used were able to infect and cause mortality at all concentrations. The percent mortality of Macrotermes varied from 60 to 100% for M. anisopliae isolate MM at 1x105 to M. anisopliae isolate PPRC-2 at 1x109, respectively. Similarly, the percentage mortality of Macrotermes varied from 25-95% for B. bassiana isolate 9609 at low concentration and isolate PPRC-56 at highest concentration, respectively. The isolates had LT50 ranging from 7.74 days in M. anisopliae isolate PPRC-2 to 8.80 days in B. bassiana isolate 9609. The concentration response with the isolate PPRC-2 showed the lowest LC50 of 3.21x105 conidia mL-1 followed by isolates MM, PPRC-56 and 9609 with LC50 of 3.82x105, 4.39x105 and 5.08x105 conidia mL-1, respectively. In conclusions, the present study suggests that the use of entompopathogenic fungi, M. anisopilae and B. bassiana, at higher concentrations for seven days is an eco-friendly effective mycoinsecticides that causes more than 95% mortality of Macrotermes.
  Waktole Sori and Wosene Gebreselassie
  Background and Objective: Mulberry, Morus spp., a temperate plant well adapted to tropical and subtropical climatic conditions gives continuous yield, the leaf, which is used as a sole nutrient source for mulberry silkworm, Bombyx mori L. The plant is commonly grown in Ethiopia as a fence. The experiment was initiated to evaluate different mulberry genotypes for agronomic and quality attributes as a feed for silk worm. Methodology: Eleven locally available genotypes were collected and evaluated for their growth, leaf yield and attributes under Jimma conditions for 2 years using a randomized complete block design, each replicated thrice. Results: There were statistical differences in growth, leaf yield and quality attributes among the genotypes. Generally, Kumbi and M4 genotypes were superior in their growth, yield and quality attributes. Better establishment, maximum shoot length, number of leaves and branches, leaf area, internodes length, leaf fresh and dry weight, leaf yield per hectare and per plant, total chlorophyll, moisture percentage, total soluble protein, total soluble sugar and NPK contents of the leaf were obtained from Kumbi collection followed by M4 genotype in all cases. Minimum growth, leaf yield and leaf quality attributes were recovered from genotype S13 followed by Saja. Conclusion: Kumbi and M4 genotypes are recommended for mulberry garden establishment as future planting material sources and further multiplied for silkworm rearing purpose in Jimma area. However, the need for further studies was suggested to investigate the effects of the genotypes on the quantity and quality of mulberry silkworm silk cocoon production.
  Temesgen Keba and Waktole Sori
  A study was conducted with the objectives to determine the resistance of maize varieties to maize weevil, Sitophilus zeamais. It was conducted at Jimma University College of Agriculture and Veterinary Medicine in entomology laboratory at room temperature of 25-27°C and 40-60% RH in 2011/2012. The maize varieties were collected from Bako and Holeta Agricultural Research Centers, Ethiopia and local market, Jimma-Merkato. A total of 13 maize varieties were screened for their relative resistance to S. zeamais. Dobie index of susceptibility was used to classify the varieties in to different reaction categories. The varieties were significantly different in terms of susceptibility index. Only one variety, ‘BHQP-542’, had 3.5 index of susceptibility and was regarded as resistant variety to maize weevil attack. However, most of the varieties, namely BH660, BH670, BH543, BHQPY545, Gibe-1, Gibe-2, Wanchi, Argane, Hora and Local variety-Orome, had index of susceptibility 4.6, 5.3, 4.7, 4.8, 4.9, 4.8, 5.2, 5.7, 5.2, 6.0, respectively and are regarded as moderately resistant to maize weevil attack. Two varieties (BH661 and Kuleni) had index of susceptibility 7.11 and 7.09, respectively and are regarded as moderately susceptible varieties to maize weevil attack. The resistant variety produced low numbers of F1 progenies (51.33), had a high median developmental time (48.33 days), a low percentage of seed damage (15.85%), less production of grain dust (powder (0.03%)), low percentage of seed weight loss (4.11%) and high percent weevils mortality (14.24%) and seed germination (93.66 (undamaged) and 86.60% (damaged)). Weevil progenies emergency is significantly and positively associated with seed damage and weight loss but inversely with median development time. The use of resistant varieties in insect pest management is an eco-friendly and cost effective means that should be promoted for S. zeamais management in maize especially for small-scale farmers in the tropics.
  Kedir Shifa , Emana Getu and Waktole Sori
  Growth, development, reproduction and yield of silkworms depend on the availability and supply of preferred host plants having good agronomic and nutritional characteristics. Eri-silkworm, Samia cynthia recini B. is a multivoltine and polyphgous insect feeding on diversified host plants among which castor is a primary host plant. There is differential preference for the different varieties of castor by S.c. ricini. In the present study, eight different castor genotypes; namely Abaro, Acc 106584, Acc 203241, Acc 208624, Ar sel, Bako, GK sel and local were evaluated for their merits as feed and nutritional sources for white plain S.c. ricini at Melkassa Agricultural Research Center, Ethiopia. The treatments were arranged in a Completely Randomized Design (CRD) in three replications. Fifty worms were used in each replication. Significant difference was observed in rearing performance of eri-silkworms when fed to leaves of different castor genotypes. Among castor genotypes fed to eri-silkworm, Abaro fed worms showed medium to maximum records of matured larval weight (8.17 g), effective rate of rearing (74.68%), survival rate (76.08%), cocoon weight (3.34 g), pupal weight (2.86 g), shell weight (0.48 g), silk ratio (14.49%), fecundity (382.00), hatchability (88.17%) and shorter larval duration (584.17 h). In conclusion, genotype Abaro was superior to the other genotypes in improving the rearing performance of eri-silkworms and can be recommended for further research and development work in integrating silkworm activities for silk and oil seed productions.
  Tarekegn Fite , Emana Getu and Waktole Sori
  Sweetpotato weevil, Cylas puncticollis, is the most destructive insect pest that ranks as the number one constraints for the production of sweetpotato in Eastern Ethiopia. A field experiment with the aim to develop compatible integrated management methods for sweetpotato weevil was conducted in 2011 cropping season at Haramaya University Horticultural Research Field (Rare) in Eastern Ethiopia. The experiment consisted of three factors: Cropping system at three levels (sole cropping of sweetpotato, sweetpotato intercropped with maize and sweetpotato intercropped with haricot bean), earthing-up at three levels (1,2 and 3 times earthing-up) and harvesting time at two levels (prompt and delayed harvesting) making up 18 treatment combinations. The treatments were replicated thrice and laid out in Randomized Complete Block Design (RCBD). Results of the studies revealed that the interaction effect of cropping systems, earthing-up and harvesting periods significantly (p<0.05) reduced sweetpotato percentage infestation and storage root damaged, number of unmarketable roots, number of weevils/kg of damaged roots. On the other hand, the interaction effect increased the number of marketable roots/plant and the total yield. Hence, from the current study it can be concluded that the integration of three times earthing-up at monthly interval starting from one month from planting; prompt harvesting, harvesting exactly at the physiological maturity of the roots; and mixed cropping of haricot bean at the ratio of three rows of sweetpotato to one row of haricot bean can sufficiently off set the risk of sweetpotato weevil (C. puncticollis) in Eastern Ethiopia.
  Fikre Lemessa , Waktole Sori and Mulatu Wakjira
  Common bean (Phaseolus vulgaris) production in the tropics is usually limited by damage due to Angular Leaf Spot (ALS) caused by Phaeoisariopsis grisola. Field experiments were conducted in 2005, 2006 and 2007 at Jimma, Ethiopia, to determine the amount of yield loss due to ALS and to investigate the relationship between ALS and bean yield. Different levels of disease severity were created on two common bean varieties (GLPX-92 and ICA15541) using natural epidemics by spraying the fungicide benomyl at 7-14- 21 and 28-day intervals and by seed dressing. Generally, all fungicide sprays significantly reduced ALS severity and increased yield and seed weight but seed dressing did not affect significantly. The relative yield and seed weight losses to ALS ranged from 2 to 47 and 15 to 33%, respectively. Single-point regression models predicted that for each per cent increase in ALS severity, there was a seed yield loss of 18 to 124.5 kg ha-1 in GLPX and 12.9 to 103.9 kg ha-1 for ICA15541 and 100-seed weight loss per sample of 100 seeds of 10 to 13 g for GLPX-92 and 13 to 22 mg for ICA15541. The study suggests that fungicide sprays affect ALS epidemics and influence the amount of loss in yield attributable to ALS permitting the crop to reach physiological maturity without being under severe infection. Thus fungicide sprays can be used as a means to reduce ALS severity and increase common bean yield.
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