Efficacy and timing of application of fungicides for control of citrus postbloom fruit drop

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• 作者：Geraldo José ; Silva-Junior^a ; ^{geraldo@fundecitrus.com.br" class="auth_mail} ; Marcel Bellato Spó ; sito^a ; ^{mbsposito@usp.br" class="auth_mail} ; Denis Rogé ; rio Marin^b ; Lilian Amorim^a ; ^{lilian.amorim@usp.br" class="auth_mail}
• 关键词：Colletotrichum acutatum ; Colletotrichum gloeosporioides ; Citrus sinensis ; Blossom blight ; Chemical control
• 刊名：Crop Protection
• 出版年：May, 2014
• 年：2014
• 卷：59
• 期：Complete
• 页码：51-56
• 全文大小：563 K

文摘

Citrus postbloom fruit drop (PFD) caused by Colletotrichum spp. occurs in several countries in the Americas reducing yields by as much as 80%. Fungicide application is the main strategy for PFD control. Two field trials were performed to assess the timing of applications and another two were set up to investigate the efficacy of fungicides for PFD control in S茫o Paulo State, Brazil. The percentage of symptomatic flowers per branch, the number of persistent calyces per branch, the number of fruit per branch and yield were evaluated. Four sprays of trifloxystrobin聽+聽tebuconazole, carbendazim, difenoconazole or cyprodinil聽+聽fludioxonil were effective in reducing yield losses due to PFD, however the trifloxystrobin聽+聽tebuconazole mixture was significantly more effective than all other treatments. The conventional PFD control programme, with one spray of difenoconazole followed by up to three carbendazim applications at different intervals, showed variable results, probably due to rainfall. The trifloxystrobin聽+聽tebuconazole mixture was effective at controlling PFD under favourable conditions for infection and can be recommended in PFD control programmes.