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Abstract
Duling the la t few yeai enormou srudie were made to develop protective
ulti lition in EgYllt” the family (Cu urbita«: M) contains approximately abcut 90cucumber varieties Are resistant to it. Infection of cucumber plant grown in the field,
with powdery mildew varies with til sell 01’ . Powdery mildew development ill the
field is dependent 10 a large extent on the environmental conditions. Exces ively high
temperature limit the development of the disea e, whereas cool temperatures and
shading enhance it (Masami Itt Ill .• 2003) There is II general sgreem III that young
leaves of cncubits are more re i tanr 10 powdery mildew than the cider leave
Uozuuii ami Yoshii. 1952). Di elise 0011(101is euerall based on the use of
fungicide. bur rhe need fOI reduced pesticides level on acceptable resistant cucumber
cultivars, dictate the need for alter n rive methods of di ea e control. one of these
methods is chemicals 0, biotic inducing agent· ( richer et (11., 1997 and Ye er (1J.,
1995).
This iuv ’ligation aimed 10:
1- I elation and ideurification the causal organism of ucuinber powdery mildew.
2· ’ludying the reaction of different cu Wilber culrivars 10 powdery mildew infection
3- Testing the effect of different biotic lind abiotic inducers lit three different
concentrations on powdery mildew disea e se erity,
4· ’elect the most effective concentration of hi ri II,1\d abiotic inducers giving the
lowe t powdery mildew disea e severity under greenhouse conditions.
5- tudy the biochemical change associated with induced resistance
Geuera, but three only are grown under protected cultivation, i.e. tWllllus Pl’.
(watermelon), Cucumis pp. {cucumber lind melon) and CucurhJra spp. ( quash &
pumpkin .
ucumber {Cl!cllmis sativus ) is one of the mo r lmportanr egetable OJ’ p ; ill
gypt it is cultivated in rbree growing eason i.e. winter under tunuel 01’ ill greenhouse
ill ~lIll1JJ1{~arnd nily season in rhe open fIeld. The cultivated area of cucumber under
greeuhou e during the growing season of 200 - rea hed I 5.404,924 tn2. The average
yield of cucumber fruits from rhi mea \V1I 62249 ton fruits (Report: of ECOll
Agric.and Sratis, Dept, Ministry of Agriculture ARE, 2005 . Cucumber fruits contain
water. protein, fats, mineral. carbohydrate. fiber. vitamin A and itamin B (95.5
0.75, 004, 255. 2 -::.0.36. 0 138 and 0.582 x 10-3 ~I-. respectively). The cucumber
fruit were recommended for the people they suffer from diabete becai e itcontains
lower contents of calori . _ calorie IOgw. (Anonymous, 1974), ln addition.
encumber has a great importance as co meticGrieve. 200 ).
Cucumber plants attacked by many funaal, bacterial and inti diseases that
affect fruit yield. DO\YllY mildew powdery mildew wilt and root rot are the most
important fungal di fa e affectillP the crop e pecially ill pla lie houses. Cucumber
powdery mildew caused by Sphaerotheca fuligtnea and/or Erysiphe oichoracearum i
a major disease, attacking cucumber plant grown in field and greenhouse. Powdery
mildew of cucumber b, s becom erious problem in greenhouse oultivauo
especially’ in grafting culrivauon for the producri II of blcoiuless fruits. Most of the
commercial varierie used in gl enhouse cultivation during the period from winter to
sprinj <Ire usceptible to powdery mildew, while most of the present summer