B: Seasonal abundance of a Maskel or Oystershell scale Lepidosaphes pallidula (Williams) infesting mango trees at Qaliobiya Governorate
Lepidosaphes pallidula (Williams) (Figure 59) was the second serious diaspidid pest on mango trees, which is distinguished from other related species by the fusion of the antennal setae into a thick one on each antenna, the presence of blunt and sclerotized marginal spur on each side of each of the 2nd & 3rd abdominal segments; and the 3rd & 4th abdominal segments with 3-6 marginal gland spines on either side. so the seasonal fluctuation is studied.
Seasonal fluctuations of a Maskel or Oystershell scale Lepidosaphes pallidula (Williams) stages and total population infesting mango trees at Qaliobiya Governorate during two studied years from 1st January 2005 till mid December 2006 as shown in tables VIII & IX and illustrated in figures from 53 to 58.
Seasonal fluctuation of the pre-adult: As in the previous tables & figure (53), it showed that: there are three peaks and three depressions during each year of the study period; the highest peak was during March, which recorded (55 insect / leaf). Although the lowest & long depression, through the two studied years, was during summer season which reached (9 scale / leaf).
Seasonal fluctuation of the adult: Data in the tables and figure (54) gave also the same results, where the adult females through the two years of investigation have three peaks, the highest one detected on early March, with 31 insect / leaf. Also the adult females have three depressions during the two years that reached 8 insect / leaf during summer season.
Seasonal fluctuation of the gravid females: As for the gravid females in the same tab...
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...lidula total population during the two years, were negative slightly significant (r = -0.012 .) Also the partial regression was positive slightly significant during the studied period, where ( p.rge. ) value equal 0.241 .
6) Effect of parasite.
The data in the previous tables indicated that the parasite had a negative slightly significant simple correlation on the studied hard scale insect total population where r. value equal -0.353 and the partial regression showed a positive slightly significant during the two studied years, ( p.rge. = 0.274)
7) The combined effect of the climatic factors and the parasite:
The combined effect of biotic and climtic factors on the mango hard scale Lep. pallidula during the two years of study was highly significant (F = 3.685) and the explained variance (E.V.) presented ( 56.5 % ) during the two years of study .