POPULATION DYNAMICS OF WHITE MANGO SCALE (AULACASPIS TUBERCULARIS (HEMIPTERA: DIASPIDIDAE) AND ITS NATURAL ENEMIES AT  SELECTED SITES IN BAHIR DAR AREA, NORTH WEST ETHIOPIA

GETIE, MELIS

dc.contributor.author	GETIE, MELIS
dc.date.accessioned	2019-09-03T08:47:18Z
dc.date.available	2019-09-03T08:47:18Z
dc.date.issued	2019-09-03
dc.identifier.uri	http://hdl.handle.net/123456789/9653
dc.description.abstract	Data on white mango scale and its natural enemies was collected from October to May 2011 E.C (2018/19) in Bahir Dar area, north western Ethiopia. Mango trees were randomly selected and leaves sampled from upper, middle and lower portions of the tree once a month and in four directions from which number of scales and their natural enemies were counted and recorded. Significantly more male colonies (F=6.7, p=0.001), live males (F=12.4, p=0.001), live females (F=34.4, P=0.001) and number of eggs (F=25.1, p=0.001) were recorded in October than in other months. In contrast, significantly high population peaks of dead female (F=28.5, p=0.001) and leaf area coverage of white mango scale (F=7.9, p=0.001) were recorded in May. White mango scale population was low during the other months. The number of dead female was significant and positively correlated with rainfall (r=0.6, p=0.02), maximum temperature(r=0.34, p =0.05), minimum temperature (r=0.70, p=0.00) and wind (r=0.5, p=0.20). On the other hand, significant and negative correlation was observed in live female (r=0.64, p=0.001) and eggs (r=0.64, p=0.001) with humidity. Live females were significant and negatively correlated with maximum temperature(r=-0.68, p=0.00), and wind (r=-0.79, p =0.00). The rest of other white mango scales and its natural enemies did not show correlations with any of the weather variables (p>0.05). Larvae predators showed high correlations with white mango scale. The numbers of most of white mango scale were higher at Poly than at Peda and Woramit. Maximum numbers of white mango scale were recorded on upper and middle portion of trees than the lower. Direction of branches did not affect the distribution and number of white mango scales. The population dynamics of predatory larvae was high and significant at (F=8.3, p=0.001) in October at Peda than other months. In contrast, adult predators were statistically significant (F=1.7, p=0.05) in April, March and February than other months. This research addressed the population flactuations of white mange scale and its natural enemies across months and correlations with weather variables. A total of six different natural enemies of white mango scale were found. Five of them were predators and the rest were parasitoids. Five predators were Chilocorus bipustulatus, Chilocorus stigma, Cryptolaemus montrouzieri, Crysoperla carnea and Lindorus lophanthea. The rest were parasitic wasps (parasitoids). The infestation level of white mango scale in Bahir Dar area is very high. Any concerned bodies including government, researchers, mango growers and other bodies should participate on management of the scale insect.	en_US
dc.language.iso	en	en_US
dc.subject	BIOLOGY	en_US
dc.title	POPULATION DYNAMICS OF WHITE MANGO SCALE (AULACASPIS TUBERCULARIS (HEMIPTERA: DIASPIDIDAE) AND ITS NATURAL ENEMIES AT SELECTED SITES IN BAHIR DAR AREA, NORTH WEST ETHIOPIA	en_US
dc.type	Thesis	en_US