{"id":179,"date":"2019-03-11T10:28:09","date_gmt":"2019-03-11T14:28:09","guid":{"rendered":"http:\/\/site.extension.uga.edu\/worthag\/?p=179"},"modified":"2019-03-22T14:23:39","modified_gmt":"2019-03-22T18:23:39","slug":"botrytis-in-onion-field","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/worthag\/2019\/03\/botrytis-in-onion-field\/","title":{"rendered":"Botrytis in Onion Field"},"content":{"rendered":"

I got a call from a consultant in regards to keeping Botrytis (gray mold of vegetables) in onion<\/strong> under control.\u00a0 The pictures below show some symptoms of white leaf spots on the onion leaves.<\/p>\n

\"\" \"\" \"\"<\/p>\n

All of the rain we have had has made it optimal conditions for rapid disease spread by way of increased moisture and humidity<\/strong>. Botrytis also has other symptoms such as, stem cankers, bulbs and tuber rots. Botrytis colonizes on weakened and dead tissue and survives on decaying plant material.\u00a0 Severe symptoms of Botrytis as shown on these leaves can lead to reduced bulb size.\u00a0<\/strong><\/p>\n

It is very important that we stay timely and implement sound fungicide programs since we are dealing with favorable disease spreading conditions. Based off of these field symptoms, Dr. Bhabesh Dutta with UGA recommended these products: Inspire Super, Omega 500, and Luna Tranquility.\u00a0<\/strong><\/p>\n

Attached is the 2019 Onion fungicide program. (Dr. Bhabesh Dutta, Extension Vegetable Pathologist)<\/strong><\/p>\n

The effective management of onion diseases begins prior to planting. By using integrated
\nmethods such as disease-free seed and transplants, proper crop rotation, disking and deep
\nploughing of plant debris, and use of resistant varieties, growers can minimize the amount of
\ndisease epidemic by either reducing the amount of initial inoculum or the rate of disease
\ndevelopment. Integrated use of management practices reduces the weight on individual
\nmanagement option and provides growers disease management options at lower risk. Chemical
\nmanagement using fungicides should be the last resort after using the other management options.
\nMost of the fungicides are effective when used as protectants, only handful of fungicides have
\ncurative actions.
\nSpray Schedule = 7 day<\/p>\n

Two weeks after transplanting: Overhead drench application of Fontelis\/RHIZ, WM, PR + Copper fungicide (foliar pathogens)
\n1 2Chlorothalonil\/BNR, BLB, PB\/ BLB, PB
\n2 Pristine or Merivon or Fontelis\/BLB, BNR, SLB, PB
\n3 Chlorothalonil\/BNR, BLB, PB\/ BLB, PB
\n4 Pristine or Merivon or Fontelis or Scala\/BLB, BNR, SLB, PB; (Scala do not
\nhave activity against SLB)
\n5 Chlorothalonil\/BNR, BLB, PB\/ BLB, PB
\n6 Pristine or Merivon or Fontelis\/BLB, BNR, SLB, PB
\n7 Chlorothalonil\/BNR, BLB, PB\/ BLB, PB
\n8 Scala or Luna tranquility or Inspire super or Omega 500 or Quadris top or
\nSwitch or Zing!\/BLB, BNR, SLB, PB (Omega 500 and Scala do not have SLB
\nactivity)
\n9 Chlorothalonil\/BNR, BLB, PB + ManKocide (bacterial blight)
\n10 Scala or Luna tranquility or Inspire super or Omega 500 or Quadris top or
\nSwitch\/BLB, BNR, SLB, PB (Omega 500 and Scala do not have SLB activity)
\n11 Chlorothalonil\/BNR, BLB, PB + ManKocide (bacterial blight)
\n12 Scala or Luna tranquility or Inspire super or Omega 500 or Quadris top or
\nSwitch\/BLB, BNR, SLB, PB (Omega 500 and Scala do not have SLB
\nactivity)+ Pristine or Merivon or Fontelis or Scala\/BLB, BNR, SLB, PB;
\n(Scala do not have activity against SLB)
\n13 Chlorothalonil\/BNR, BLB, PB + ManKocide (bacterial blight)
\n14 Scala or Luna tranquility or Inspire super or Omega 500 or Quadris top or
\nSwitch or Zing!\/BLB, BNR, SLB, PB (Omega 500 and Scala do not have SLB
\nactivity)
\n15 Chlorothalonil\/BNR, BLB, PB + ManKocide (bacterial blight)
\n2
\n16 Scala or Luna tranquility or Inspire super or Omega 500 or Quadris top or
\nSwitch\/BLB, BNR, SLB, PB (Omega 500 and Scala do not have SLB activity)<\/p>\n

The fungicide spray for downy mildew (DM) will be based on a forecasting model. Alerts for
\nthe DM spray will be communicated by the Vidalia Onion and Vegetable Research Center and
\nthe UGA, Tifton. Fungicides with some degree of efficacy on DM are: Reason, Zampro,
\nOrondis Opti and Omega 500.
\n1Please use the labeled rate of recommended fungicide. Rotate fungicides for good disease
\ncontrol.
\n2Chlorothalonil (Bravo, Echo, Equus etc)
\nDisease acronyms: BNR=Botrytis neck rot; BLB=Botrytis leaf blight; PB=Purple blotch;
\nRHIZ=Rhizoctonia root rot; WM=White mold; PR=Pink root; SLB=Stemphylium leaf blight;<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

I got a call from a consultant in regards to keeping Botrytis (gray mold of vegetables) in onion under control.\u00a0 The pictures below show some symptoms of white leaf spots on the onion leaves. All of the rain we have had has made it optimal conditions for rapid disease spread by way of increased moisture […]<\/p>\n","protected":false},"author":217,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,10],"tags":[],"class_list":["post-179","post","type-post","status-publish","format-standard","hentry","category-plant-pathology","category-vegetable-production"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/179","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/users\/217"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/comments?post=179"}],"version-history":[{"count":1,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/179\/revisions"}],"predecessor-version":[{"id":183,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/179\/revisions\/183"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/media?parent=179"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/categories?post=179"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/tags?post=179"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}