First Report of Bacterial Leaf Streak of Rice Caused by in Guangdong Province, China.

Rice (Oryza sativa L.) is a crucial staple crop worldwide, and bacterial diseases are among the primary factors affecting rice yield. In late October 2022, bacterial leaf streak disease was observed on the leaves of the rice variety Meixiangzhan 2 across multiple fields (approximately 130 hm2) in Leizhou City, Guangdong Province, China.

A novel synthesis of ethyl carbonate derivatives of β-cyclodextrin.

The carbonate ester derivatives of β-cyclodextrin play a very important role in several fields, such as catalytic reaction and enantiomer separation. In this work, a novel synthesis process of the β-cyclodextrin carbonate ester has been investigated through the reaction between β-cyclodextrin and diethyl carbonate with anhydrous potassium carbonate as catalyst. The compounds were separated by semi-preparative chromatography and characterized by FT-IR, MS, (1)H NMR, and (13)C NMR spectroscopy.

[Population dynamics of pests and their enemies in different cultivated rice fields].

Through a whole year field investigation, this paper analyzed the population dynamics of pests and their enemies in organic and normally cultivated rice fields. The results indicated that the population of main pests varied more lightly in organic than in normally cultivated rice field, while subordinated pest species had little difference between these two fields. The individuals of enemies were more in organic than in normally cultivated rice field.