CROP-ENVIRONMENT-DISEASE INTERACTION STTJDY ON ASCOCHYTA BLIGHT OF CHICKPEA (Eicer arietinwm L.) Dissertation Suh!~r~iic,d io ilie 1-'1111jiib ~t~ricrr/friral Univers~ty ;!I ptiriiul Jii/j~/iirc~~i of /Ire ~C(~III~~!II~IIIS for tlir df'gree of DOCTOR OF PHILOSOPHY IN AGRICULTURAL METEOROLOGY Department of Agricultural Meteorology College of Agriculture PUNJAB AGRICULTURAL UNIVERSITY LUDHIANA-141 004 1996 DBDma3,A%-IIL.;TID TlI-a> my revered rnm-kbrer m Xaaiuri Devi CERTIFICATE - I This is to certify that this dissertation entitled. "Crop-Environment-Ilisease lnteracliun sludy on Ascochyta Blight of Chickpea (Cicer arielinun I..)", suh~nitted to the Punjab Agricultural University. Ludhiana, in partial fulfilment of the requirements for the degree of Doctor of Philosophy in the subject of Agricultural Meteorology (Minor subject: Plant Pathology), is a bonafide research work carried out by Mr OM PAHKASH JHOHAH (I,-92-A- 35-1)) under the rupervision of Dr. H.S. Mavi. Professor of Agromcteorology, upto September. 1995 and under my supervision thereafter and that no part of thir thesis ha5 been rub~nitted for any other degree The assistance and help received during the course of investigation have ken fully acknowledged. MA~OH AI)VISOH lI)r S.S. Mathauda) Associate Proferror of Agrometeorology Deptt. CERTIFICATE - I1 This is to certify that this dissertation entitled. "Crop-Environment-Disease Interaction study on Ascochyta Blight of Chickpea [Cicerarietinrrn L.)", submittetl by Mr OM PARKASH JHORAR (L-92-A-35-D) to tlic Ptlnjal~ Agricultc~ral University, Ludhiana, in parlial ftllfilnlent of the reqllirsnlenl lor tlie tlcgrce of Doctor ol Philosophy in the subject of Ag~ic~lll~~~al Molcorology (Mino1 s~~l)jcct: Plntil Pathology) lias been approved by the Slutlent's Advisory Col~lrr~iltee afler an oral examination on tlie sanle, in collaboration will1 an Exterrlal Exar~line~ {Dr S.S. Mathauda) [Dr S.S. Hundal) - k~' y-q\g\?6 DEAN. POST-GRADUATE STUDIES It givcs me Xrecrt ~IEUJU~~ 10 ~,III~L,SS nty sitri.e,rc, thir~rk.\ rr~tcl 111,1,1j ,S~IISC cf'gr~r~i~ucle~ nty mujor advisors Dr H.S. Mavi, Professor rf Ayrontctt~nrolngy (Re~lrl. j crtld Dr S.S. Mathauda, Associate Professor of Ayromcteoro/c~gy, fin- i~ts~~irtttiot~, ~~o~~stcrttl r~~r~~ourrrgent~r~I. grriclatr~~c supcwisio~l and ct~~tstrrictii~r criticism i~z prt~portrticrt~ of this ntrrrz~rsi,ril~r. I om ittdrhted to Dr D.R. Butler, Pri~ri,ipcrI Sri~tttixt (Mi~~roi~lin~~ttolORy) fir his sul,ewisiott, suygestions uttd criti~~ctl commo~t.\ it1 co~t~lu~'tittg cv~tztrnlled ~~~tvirottnrc,trr strrdic.\ mtrd hritlgitrg out the mo~tus~.ri/~t 11f diss~'rrntiorr it1 fit1111 shrrl~e. I ant hixhly thrrtzlJii1 to hint filr orrattying futilities crtrd fitrcr~tcefi~r ex~~erint~ttt.\ 11s ~'~~11 cr~ nry contjbrtohli~ st~ty ot ICHISAT. My .\ittcerr, ucktzowlecigcnre~tts