Nematicidal Screening of Aqueous Extracts from Plants of the Yucatan Peninsula and Ecotoxicity.

Active metabolites from plants are considered safer than synthetic chemicals for the control of plant-parasitic nematodes of the genus . In the present work, 75 aqueous extracts (AEs) from different vegetative parts of 34 native plant species of the Yucatan Peninsula were evaluated against second-stage juveniles (J2s) of and in microdilution assays. The highest mortality (M) against both species was produced by the foliar AE from (M ≥ 94%) and (M ≥ 77%) at 3% / after 72 h.

Common weeds as alternate hosts of Mexican variant of Papaya meleira virus in papaya orchards in México.

Presence of alternate hosts of plants is a great threat to the agriculture industry. Plants from several species growing in the papaya orchards affected by papaya sticky disease were examined for Papaya meleira virus (PMeV) infection causing this disease. The viral dsRNA was already detected in some plants from the family Poaceae or in watermelon.

Decolorization of Textile Effluent by Trametes hirsuta Bm-2 and lac-T as Possible Main Laccase-Contributing Gene.

The decolorization of dye and textile effluent by Trametes hirsuta was studied in both induced and non-induced media. A removal of 70-100% of the color was achieved through adsorption and the action of laccases. Laccase activity was increased significantly with the addition of grapefruit peel (4000 U/mL) and effluent with grapefruit peel (16,000 U/mL) in comparison with the basal medium (50 U/mL).

(Hemiptera: Cicadellidae)-Mediated Transmission of Papaya Meleira Virus-Mexican Variant in Mexico.

Papaya meleira virus (PMeV) causes sticky disease in in Brazil and Mexico. Despite its economic importance and the need for effective phytosanitary control, it remains unknown whether any insect is the vector of this virus. The aim of this work was to identify potential insect vectors of the PMeV-Mexican variant (PMeV-Mx) and determine whether these potential vectors are capable of transmitting the virus.

Molecular characterization of laccase genes from the basidiomycete Bm-2 and analysis of the 5' untranslated region (5'UTR).

The aim of this study was to identify and characterize laccase genes produced by Bm-2 in a liquid medium, both with and without induction. The amplification of 5'and 3'regions of laccase sequences was obtained by the RACE-PCR method, and these were assembled to obtain a cDNA of total length. Two new laccase genes were isolated from basal medium (-) and lignocellulosic grapefruit substrate (-), both encoding open reading frames of 2566 bp.