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爛種原因：種(zhong)子(zi)(zi)質(zhi)量(liang)(liang)差或(huo)貯藏不當、貯藏期(qi)過(guo)長(chang)(chang)；地(di)(di)勢低洼，土壤黏重，質(zhi)地(di)(di)差，土壤含(han)水量(liang)(liang)高，種(zhong)子(zi)(zi)出(chu)(chu)苗時(shi)(shi)間(jian)長(chang)(chang)；整地(di)(di)不實(shi)，影響(xiang)種(zhong)子(zi)(zi)對(dui)水分(fen)的(de)吸收，苗弱；種(zhong)子(zi)(zi)沒有(you)(you)精選，大小不勻(yun)，播種(zhong)不細或(huo)深淺不一(yi)，造(zao)成(cheng)出(chu)(chu)苗不齊或(huo)缺(que)苗斷壟(long)；多年連作(zuo)不倒茬，苗期(qi)病害嚴重，造(zao)成(cheng)缺(que)苗斷壟(long)；施(shi)用未充分(fen)腐熟的(de)有(you)(you)機肥(fei)(fei)或(huo)施(shi)肥(fei)(fei)濃(nong)度(du)過(guo)高，造(zao)成(cheng)肥(fei)(fei)害，影響(xiang)出(chu)(chu)苗；低溫待續時(shi)(shi)間(jian)長(chang)(chang)，造(zao)成(cheng)發芽出(chu)(chu)苗遲(chi)緩而爛種(zhong)。
預防措施：(一(yi))精細(xi)選種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)。選用(yong)新花生(sheng)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)，對留種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)花生(sheng)適期(qi)收獲并及(ji)時曬(shai)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)，做到科(ke)學貯藏。播(bo)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)前帶(dai)皮曬(shai)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)，加快花生(sheng)新陳代謝，增強種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)滲透力，提(ti)(ti)高(gao)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)吸(xi)水能力。播(bo)前1～3天剝(bo)殼，選粒大無損傷(shang)、胚根未萌動的(de)(de)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)播(bo)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)。(二(er))藥(yao)劑(ji)拌(ban)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)。用(yong)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)重量0.1%的(de)(de)50%的(de)(de)甲基硫菌靈(ling)(ling)或50%的(de)(de)多菌靈(ling)(ling)可(ke)(ke)濕性(xing)粉劑(ji)拌(ban)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)，預防苗期(qi)病(bing)(bing)害。也可(ke)(ke)拌(ban)入種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)重量0.2%的(de)(de)50%的(de)(de)辛硫磷(lin)乳(ru)油防治地(di)下害蟲及(ji)鳥(niao)害和鼠害。(三)精細(xi)播(bo)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)。播(bo)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)深(shen)度(du)4～6厘米(mi)，要避免種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)與肥(fei)料接(jie)觸(chu)。采(cai)用(yong)地(di)膜覆蓋(gai)栽培，地(di)溫可(ke)(ke)提(ti)(ti)高(gao)2～3℃，播(bo)后種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)子(zi)發芽、出苗快，可(ke)(ke)減(jian)輕(qing)發病(bing)(bing)。