Effects of Preharvest Applications of CaCl₂, 2,4‐D and Benomyl and Postharvest Hot Water, Yeast and Fungicide Treatments on Development of Decay on Satsuma Mandarins

Abstract

In this study, an integrated approach was evaluated for the control of postharvest decays of mandarin including some pre-and post-harvest treatments under storage conditions. The efficacy of the treatments both as alone and in combination was evaluated during 3 years. Preharvest application of benomyl resulted in significantly less decay of mandarin fruit after storage in 3-year tests. Calcium chloride (CaCl 2 ), 2,4-dichlorophenoxyacetic acid (2,4-D) and gibberellic acid (GA 3 ) as stand-alone treatments or combinations were not effective in controlling Penicillium and total decay infections on inoculated mandarin. Postharvest application of imazalil (200 lg/ml) in solution heated to 54°C for controlling postharvest green and total decay of mandarin was significantly effective for 3 months under storage conditions. The biocontrol activity of yeast (Metschnikowia pulcherrima) was improved when yeast treatment was combined with imazalil (200 lg/ml) at postharvest. The data suggest that preharvest application of benomyl and postharvest treatments of imazalil, hot water and yeast may reduce postharvest green mould and total decay of mandarin under storage conditions. J. Phytopathology 153, 94-98 (2005) Ó 2005 Blackwell Verlag, Berlin

Potential of some bacteria for biological control of postharvest citrus green mould caused by Penicillium digitatum

“…Therefore, the inhibition of spore production of P. digitatum by A-16 and TV-17C was very important and would have great advantage for suppression of the post-harvest disease. The postharvest disease control relies on the use of synthetic fungicides (Ecker & Ogawa 1988) such as imazalil, sodium ortho-phenylphenate or thiabendazole (Yildiz et al 2005;Torres et al 2007). However, these chemical agents have been applied for many years with few little or limited success due to the development of resistance by the fungus (Zamani et al 2006).…”

Efficacy of integrated postharvest treatments against mixed innoculations ofpenicillium digitatumandgeotrichum citri‐aurantiiin ‘leng’ navel oranges (citrus sinensis)

“…In a separate study, a heated imazalil treatment contributed to less green mould on navel oranges than the same treatment at ambient temperatures (Smilanick et al 1997). The same result was also achieved on other citrus varieties (Yildiz et al 2005). Citrus packingsheds often have mixed infections of penicillium and sour rot, and treatments that are efficacious against more than one pathogen merit investigation.…”

AISLAMIENTO E IDENTIFICACIÓN DE HONGOS PATÓGENOS DE NARANJACitrus sinensisL. OSBECK CULTIVADA EN BAJA CALIFORNIA SUR, MÉXICO ISOLATION AND IDENTIFICATION OF PATHOGENIC FUNGI FROM ORANGECitrus sinensisL. OSBECK CULTURED IN BAJA CALIFORNIA SUR, MEXICO

“…Entre los aislamientos obtenidos, P. italicum y P. digitatum, comúnmente conocidos como moho azul y moho verde, respectivamente (Yildiz et al, 2005), ya han sido reportados como patógenos poscosecha de los cítricos (McGuire, 2000;Wild, 1994) y son responsables de pérdidas económicas en todo el mundo (Skouboe et al, 1999). La infección comienza con la penetración de las esporas en las heridas de los frutos en el árbol, durante la cosecha o el transporte (Spotts et al, 1998).…”