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13970256833

櫻花的穿孔病防治

  • 發(fā)布時(shí)間:2023-08-17

褐斑穿孔病 

葉部初起褐色、灰褐色或紫褐色小點(diǎn),逐漸形成圓形斑,非水漬狀,不透明,病斑周?chē)鸁o(wú)黃綠色暈圈,直徑2~4mm,病斑鴻溝清楚,外圍紫褐色。后期中部白或褐色,略帶輪紋,病斑枯死脫落,形成犯警則的穿孔。

2、發(fā)生紀律:病菌在落葉上越冬,翌年春季借風(fēng)雨傳布。6月起頭發(fā)病,8~9月為發(fā)病盛期,降雨量年夜則病害發(fā)生與風(fēng)行,樹(shù)勢虛弱,發(fā)病嚴重。

3、防治體例:

①連系冬季修剪整枝,剪除病枝,斷根枯枝落葉,削減侵染源。

②春季樹(shù)發(fā)芽前噴灑石硫合劑進(jìn)行呵護。

③6月發(fā)病初期噴灑瑞毒霉錳鋅、加瑞農、甲基托布津等藥劑防治。

細菌性穿孔病

1、癥狀:病害要發(fā)生在葉片上,枝梢也能受侵染。葉片起頭呈現水漬狀小褐點(diǎn),爾后擴展成圓形或多角形病斑,褐色或紫褐色,病斑周?chē)悬S綠色暈圈。潮濕情形下,病斑后背有淺黃色菌溢,后期病斑脫落形成穿孔。枝梢受害后形成黑色凹陷而且龜裂。

2、發(fā)生紀律:病菌在枝梢病斑和病芽?jì)仍蕉?,春季靠風(fēng)雨和昆蟲(chóng)傳布陰雨連綴或蚜蟲(chóng)、葉蟬為害嚴重時(shí)輕易造成病害風(fēng)行。

3、防治體例:

①合理修剪,增添通風(fēng)透光;合理施肥,增強發(fā)展勢。

②春季發(fā)芽前噴灑波爾多液,覆滅病原。

③發(fā)病初期噴灑多菌靈、可殺得等藥劑防治。


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