Cercospora leaf spot (CLS), caused by the fungus Cercospora beticola (Sacc.), is the most destructive foliar pathogen of sugarbeet worldwide. Control measures include the use of resistant varieties and crop rotation, but timely fungicide applications are essential for CLS management. Resistance to sterol demethylation inhibitor (DMI) fungicides (FRAC group 3) has been increasing in C. beticola ...

In this paper, a sensitive analytical method for four fungicides (procymidone, folpet, vinclozolin and ditalimfos) in environmental water and juice samples was developed by using magnetic solid-phase extraction (MSPE) with magnetic graphene nanocomposite (G-Fe3O4) as the adsorbent, followed by determination with gas chromatography and electron capture detection. Parameters such as the amount of...

A simple and rapid flow-injection method is reported for the determination of dithiocarbamate fungicides (maneb, nabam and thiram) based on chemiluminescence detection. The method involves the photodegradation of dithiocarbamate fungicides via UV light in an alkaline medium. Photoproducts are then reacted with luminol in the absence of an oxidant. Linear calibration graphs were obtained in the ...

Fusarium oxysporum strain CS-20 reduces incidence of Fusarium wilt in tomato and other crops. To be integrated into most production systems, strain CS-20 must be compatible with other management practices. We assessed the compatibility of strain CS-20 with seven fungicides recommended for tomato in Maryland. Radial growth of strain CS-20 was recorded on agar medium amended with various concentr...

Sorption-desorption of two different hydrophobic fungicides, penconazole and metalaxyl, by a series of clay minerals layered and non-layered (montmorillonite, illite, kaolinite, muscovite, sepiolite and palygorskite) modified with the two-chain cationic surfactant, dihexadecyldimetylammonium (DHDDMA) was studied by first time in this work. DHDDMA-clays showed a good capacity to sorb both fungic...

BACKGROUND Bumble bees [Bombus impatiens (Cresson)] are widely used for supplemental pollination of greenhouse vegetables and are at risk of pesticide exposure while foraging. The objective of this study was to determine the lethal and sub-lethal effects of four insecticides (imidacloprid, abamectin, metaflumizone and chlorantraniliprole) and three fungicides (myclobutanil, potassium bicarbonat...

Fungicide application is a key factor in the control of mycotoxin contamination in the harvested wheat grain. However, the practical results are often disappointing. In 2000-2004, 2006-2008 and 2007 and 2008, three experiments were made to test the efficacy of fungicide control on Fusarium Head Blight (FHB) in wheat and to find ways to improve control of the disease and toxin contamination. In ...

Chemical fungicides are an important component in disease management for most crops. As part of a program to discover natural product-based fungicides, several sensitive assay systems have been developed for the evaluation of naturally occurring antifungal agents. In this study, we focused on the discovery and evaluation of new natural product-based fungicides from Angelica sinensis (Dong Quai)...

approved: _______________________________________________________ Christopher Mundt Fungicide resistance has become an increasing problem in North American populations of Zymoseptoria tritici, the causal agent of septoria leaf blotch of wheat. The goal of this experiment was to determine whether Z. tritici’s resistance to one azole fungicide would predict resistance in other fungicides within t...

There are two mildew diseases affecting cucurbit crops: powdery mildew and downy mildew. Both fungal pathogens produce wind-dispersed spores that can be moved long distances, thus they cannot be avoided. Fungicides and resistant varieties have been important for managing these diseases. Unfortunately, both pathogens have demonstrated ability to evolve new strains that are not controlled as effe...