الفهرس 
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Abstract
This study was carried out during 1999-2000 and 2000-
2001 seasons on fruitful mango trees (about 30 year old) of four
cultivars varied in their susceptibility to the malformation
disorder (Taymour; Zebda: Hindi Be-Sinnara and Alphonse
cvs.). Taymour is the most susceptible one, Zebda is the highly
resistance while two other ones are intermediate.
The first part (field) of study was devoted to investigate
some remote sensing measurements for distinguishing between
mango cultivars concerning their susceptibility to malformation;
sprouting nature (leafy or floral) and photosynthesis activity of
their leaves at different ages.
However, the second part (field) of study was dealing
with investigating the chemical composition (nutritional states,
chlorophyll content and endogenous growth regulators levels) in
relation to mango cultivar and its susceptibility to malformation.
v. I. Part one ”remote sensing measurements”:
V. I. A. Field / open remote sensing measurements:
v. I. A. 1. Field spectrometric measurements:
Spectral reflectance% of Taymour terminal buds were
measured monthly (from Oct. tell Feb. / March) (50 terminal
buds of spring flushed shoots / each tree) using the field hand
radiometer (Exotech model 100 AX) during 1999-2000 and
2000-2001 seasons.
Spectral reflectance% of Taymour terminal buds (of the
fifty tagged spring flushed shoots per each tree) from the
V SUMMARY AND CONCLUSION - 191-
selected five trees devoted for this study were monthly measured
(from Oct. tell Feb. / March) during both 1999-2000 and 2000-
2001 seasons. After sprouting of these tagged buds had been
taken place in Feb. or March during both seasons, they were
classified according to nature and states of their sprouting into
four groups (a- healthy/normal leafy buds, b- normal floral buds;
c- malformed leafy buds and d- malformed floral buds).
Thereafter, reflectance% at various specific wave length (from
0.5-1.1tim) was estimated separately for each case (groups) per
every tree (replicate). Data obtained revealed that:
1- It was so difficult to distinguish between floral and leafy
terminal buds through variance in their spectral reflectance % of
the October sampled buds, regardless of domain of spectrum
(visible or invisible). However, the reverse was true to
distinguish between the normal and malformed terminal buds,
whereas it was so easy to observe that the reflectance% of
October measured buds was greatly higher in normally sprouted
buds than malformed ones (in both spectral domains).
2- At all measuring dates (month) spectral reflectance% of
both normally sprouted leafy and floral buds exceeded obviously
those of the analogous ones (malformed leafy and floral terminal
buds).
3- The normally sprouted floral buds surpassed to some
extent the healthy leafy buds regarding their reflectance% in
both visible and invisible domains from one hand, but the
variance was more pronounced and reached level of significance
in the invisible domain especially the near infrared (0.8-1.1pm)
from the other.
V. SUMMARY AND CONCLUSION - 192-
V. I. A. 2. Field thermometric measurements:
Thermal emission of new sprouted shoots:
In this regard the emissivity of new sprouted shoots in
response to specific and interaction effects of growth state
(normal or malformed) and mango cultivars was investigated at
8.0 Am and 4.0 Pm. Data obtained revealed the following:
Specific effect:
1- Differences due to sprouting state proved that emitted
thermal infrared radiation by malformed shoots was significantly
higher than the corresponding value of normal shoots of
measurements at either 8.00 Am or 4.0 Pm
2- Variances between mango cultivars were less pronounced,
however Alphonse was the superior and other 3 cvs. were
similar.
Interaction effect:
The highest value of thermal emission was in concomitant
to malformed shoots of Alphonse, but the reverse was true with
the normal shoots of both Zebda and Alphonse mango cvs.; other
combinations were in between.
Thermal emission of mango leaves:
Data obtained regarding the specific and interaction
effects ofleafage (3, 6,18 month old) and mango cvs. showed
that:
Specific effect:
As for the specific effect of leaf age, data obtained
pointed out that thermal emission was significantly in positive
relationship to leaf age. Moreover, emissivity was also
responded to cultivar, whereas Zebda leaves were the superior
V SUMMARY AND CONCLUSION --
followed in descending order by Alphonse, Hindi Be-Sinnara
and Taymour.