Experiment of using 2 kinds of 0.5% Guosheng Liquid for control of citrus red mite and arrowhead scale.
An experiment was carried out with 4-year-old orange trees of cultivar Jincheng grafted onto trifoliate rootstock (Poncirus trifoliata). The goal was to investigate chemical control of citrus red mite [Panonychus citri] and arrowhead scale [Unaspis yanonensis]. The pesticides used were 0.5% Guosheng liquid 1 [of unstated composition], 0.5% Guosheng liquid 2 [of unstated composition]; 15% pyridaben emulsion and 40% Supracide [methidathion] emulsion. Different concentrations of solutions were sprayed for control of citrus mite (Panonychus citri) and arrowhead scale (Unaspis yanonensis). Results showed that the efficacies of both 0.5% Guosheng liquids were similar to 15% pyridaben emulsion; they were slower to take effect than the pyridaben but were longer lasting. Overall, 0.5% Guosheng liquid 1 was deemed to perform best in controlling both pests; the effectiveness of a 1000x diluted solution was better than that of a 1000x diluted solution of 40% Supracide.