000 03868cas a2200445 a 4500
005 20260818113315.0
008 111005s1991 th uu|m rtt 0| a1eng d
035 _a.b10269848
099 9 _aAIT Thesis no.AE-91-41
100 1 _aPanapanaan, Virgilio M.
245 1 0 _aFactors in the spread of brown planthopper, Nilaparvata lugens (Stal.) outbreaks in Central Thailand
260 _aBangkok :
_bAsian Institute of Technology,
_c1991
300 _a116 p. +
_e1 online resource
490 1 _aThesis ;
_vno. AE-91-41
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science
502 _aThesis (M.Sc.) - Asian Institute of Technology, 1991
520 _aThe Brown planthopper outbreak in Sri Prachan District was studied to evaluate its impact to the farmers' rice production system. With the varying degrees of infestation in the study area, an estimated damaged area out of 7,471 rai total rice cultivated area during the crop year 1990 was about 3,815 rai which is 51.66%. Analysis of the outbreak revealed that the popular cultivation of RD 23 in wet season and Suphan 60 in the dry season favored the BPH massive increase. The increased use and misuse of pesticide particularly monocrotophos and pyrethroid aggravated the situation. However, as to fertilizer usage of the farmers, though kinds and rates varied across locations, it was not a clear indication that it directly influence the BPH infestation, but its greening effects explicitly suggests that it could enhance or trigger the insect pest BPH. Farmers ultimate response to BPH problem is indiscriminate spraying of chemicals. Variations as to farmers pesticide preferences, rates and timing of application explains for itself why the severity also varied from highly affected area down to the least affected area. The attitude of the farmers towards government provision and control measures is favorable but insufficiency of control measures is the common feedback by most farmers. The governments' response towards BPH problem is so dramatic at the national level, that is, featured by immediate provision of necessary control measures and policy approvals. Village magnification of government assistance reflected that there seemed to be a slow pace in extension process as reflected by low percentage of farmers who received the assistance during the BPH infestation. The insufficiency of control measures given and distribution disparities across villages also speaks for extensions' relative inefficiency.
650 0 _aPlanthoppers
_zThailand, Central
700 0 _aSuthad Setboonsarng,
_eChairperson
700 1 _aWeber, Karl E.,
_eCo-chairperson
700 1 _aWaibel, Hermann,
_eExamination committee
700 1 _aDemaine, Harvey,
_eExamination Committee
710 2 _aDeutscher Akademischer Austauschdienst,
_eScholarship donor
710 2 _aFederal Republic of Germany,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. AE-91-41
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B17290
907 _a.b10269848
_bmnait
_cs
902 _a240401
998 _b2
_c951012
_dm
_ea
_fs
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c22
942 _c20
942 _c40
909 _aBarcode : 30050120581342
_bCREATED : 2013-06-09
_cRECORD # : i12740901
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050120581334
_bCREATED : 2014-11-27
_cRECORD # : i12829183
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050120363030
_bCREATED : 2016-05-27
_cRECORD # : i13000615
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c42938
_d42938