Article InformationMango is attacked by many insect pests which reduce the quality and productivity of the crop. Among the insect pests attacking mango plant, white mango scale is the most devastating insect pest. White mango scale, was reported since 2010 from Guto Gida district of East Wollega zone. The distribution and severity of white mango scale was studied in selected 5 districts and 10 kebeles of East and West Wollega and insect infestation and the degree of damage. Results of the survey showed that from the sampled five districts white mango scale distributed to all four districts except Mana Sibu. From the survey it was known that the maximum distance white mango scale dispersed from Loko Keble (Guto Gida district, which was assumed to be the source of original infestation) was 67 km to the West and 58 km to the East direction. Distribution and severity status comparisons between sampled districts and administrative kebele"s for the formation of clusters of white mango scale per leave per mango showed significant difference at P=0.05 indicating different pest status in the study areas. Moreover, yield data before and after mango scale appearance showed high significant difference. From the current survey it was found that white mango scale is becoming the most important limiting factor for mango production in Western Ethiopia. The dispersal rate is alarming indicating that within a short period of time the pest can invade the whole of Western Ethiopia particularly Wollega zones. Hence, due attention should be given to this pest, so that ecologically friendly management options will be made available for the mango growers in that part of the country in particular and Ethiopia in general.

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This study was conducted to evaluate the potency of aqueous A. indica leaf powder extract (LPWE) against A. tubercularis infesting mango. Field experiments were conducted in Ethiopia at two experimental sites, western Oromia. Randomized Complete Block design was laid in four replications with four blocks consisting of sixteen treatment plots. The treatments were 0.05, 0.1 and 0.15 mg/ml spray concentrations made from A. indica LPWE. The treatments were applied 3 times at 10-day interval and the mortality count was carried out 10 days after 1st, 2nd and 3rd treatment applications. The results of the study confirmed that among the tested three different concentration of A. indica LPWE 0.15 mg/ml concentration significantly (p < 0.05) reduced the population of sessile A. tubercularis at both experimental sites. The results also indicated that male adults and nymphs were more affected than females. The population of sessile A. tubercularis significantly decreased as the concentration of A. indica LPWE increased in comparison with the check plots. Thus, the use of A. indica LPWE at high concentrations led to a notable population reduction of sessile A. tubercularis and its effects. Hence, the use of A. indica LPWE can be recommended for A. tubercularis management as part of integrated pest management.

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