المرض عبارة عن نشاط فسيولوجي ضار ينشأ داخل النبات مما يعيق النبات عن القيام بوظائفه الحيوية نتيجة لإصابة النبات بكائنات حية  أو نتيجة لتعرض النبات لظروف بيئية غير مناسبة وهذا بدوره ينعكس علي النبات في صورة أعراض ظاهرية نتيجة التفاعل بين الظروف البيئية و النبات و الكاائنات الحية

عموماً العوامل البيئية تسبب أمراض غير معدية و لكنها تؤثر على العائل من حيث طبيعة نموه و مدى قابليته للمرض و أيضاً تؤثر على المسبب المرضى من حيث فاعليته و إنتقاله وتحركه داخل النبات و قد يكون التغيير فى العوامل البيئية كثيراً فجائياً و هذا التغيير يؤثر على إحداث الأمراض الجديدة أو تكشف أمراض موجودة بالفعل

إستخدام المعاملات بالمبيدات الجهازية أوالمطهرات الفطرية أو المضادات الحيوية من الوسائل الأساسية للوقاية من الإصابة أو العلاج أو الحد من الأمراض سواء الفطرية و البكتيرية والنيماتودا و غيرها  بينما لا تصلح مع الأمراض الفيروسية التى لا تعرف بالأعراض المرضية فقط و أن هذه الأمراض الفيروسية تسبب مشكلة فى إنتاج المحاصيل الإقتصادية من حيث الكم و النوع و بعض منها يؤدى بتشوهات بالمجموع الخضرى و الثمرىو بذبول و موت الأنسجة و بالتالى موت النبات بأكمله.

 فمن الطبيعي أن يكون العائد المتوقع من دراسة الأعراض المرضية ومسبباتها والكيفية التي تتم بها الإصابة الفيروسية هو التفكير المنطقي في الكيفية التي يجب إتباعها لمحاربة هذة الأمراض من أجل تحسين إنتاجية  النبات كماً ونوعاً. وأيضاًَ إبتكار طرق مختلفة للمكافحة تختلف باختلاف نوع المسبب المرضي والنبات العائل والتفاعل بينهما بجانب العديد من العوامل الأخري المتغيرة

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mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Arial;mso-bidi-theme-font: minor-bidi;mso-bidi-language:AR-EG'>المثلث المرضي<span style='mso-spacerun:yes'>  </span></span></b><span dir=LTR></span><b><span lang=AR-EG style='mso-bidi-language:AR-EG'><span dir=LTR></span><span style='mso-spacerun:yes'> </span></span><span style='mso-spacerun:yes'> </span>Disease Triangle<o:p></o:p></b></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> </v:shape><v:shapetype id="_x0000_t5" coordsize="21600,21600" o:spt="5" adj="10800" path="m@0,l,21600r21600,xe"> <v:stroke joinstyle="miter" /> <v:formulas> <v:f eqn="val #0" /> <v:f eqn="prod #0 1 2" /> <v:f eqn="sum @1 10800 0" /> </v:formulas> <v:path gradientshapeok="t" o:connecttype="custom" o:connectlocs="@0,0;@1,10800;0,21600;10800,21600;21600,21600;@2,10800" textboxrect="0,10800,10800,18000;5400,10800,16200,18000;10800,10800,21600,18000;0,7200,7200,21600;7200,7200,14400,21600;14400,7200,21600,21600" /> <v:handles> <v:h position="#0,topLeft" xrange="0,21600" /> </v:handles> </v:shapetype><v:shape id="_x0000_s1039" type="#_x0000_t5" style='position:absolute; left:5094;top:12817;width:2106;height:1815'> <v:textbox> <![if !mso]> <table cellpadding=0 cellspacing=0 width="100%"> <tr> <td><![endif]> <div> <p class=MsoNormal><span dir=RTL></span><b><span lang=AR-EG dir=RTL style="font-family:"Arial","sans-serif";mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-bidi-theme-font:minor-bidi; mso-bidi-language:AR-EG" mce_style="font-family:"Arial","sans-serif";mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:Arial;mso-bidi-theme-font:minor-bidi; mso-bidi-language:AR-EG"><span dir=RTL></span><span style='mso-spacerun:yes'>  </span>المرض</span></b><b><span style='mso-bidi-language:AR-EG'><o:p></o:p></span></b></p> </div> <![if !mso]></td> </tr> </table> <![endif]></v:textbox> </v:shape></v:group><![endif]--><!--