A survey was undertaken in China between 1996 and 2001 for phytophagous insect fauna associated with mile-a-minute weed, Polygonum perfoliatum L. (Polygonaceae). The purpose was to identify potential biological control agents for this invasive plant in the eastern USA. The survey covered 23 provinces including northeastern China, where the climate is similar to that of the eastern USA, and sout...

Factors promoting the evolution of specialists versus generalists have been little studied in ecological context. In a large-scale comparative field experiment, we studied genotypes from naturally evolved populations of a closely related generalist/specialist species pair (Polygonum persicaria and P. hydropiper), reciprocally transplanting replicates of multiple lines into open and partially sh...

Polygoni Perfoliati Herba is widely used in China with antibacterium, anti-inflammatory, expectorant, antitumor, and antivirus activities. To reveal the mechanisms of the activities of Polygoni Perfoliati Herba, the relationship between the fingerprinting profile and its bioactivities was investigated. In the present study, high-performance liquid chromatographic (HPLC) fingerprinting method wa...

Erysiphe is the largest genus of powdery mildews (PMs), a group obligate plant pathogenic fungi. Exploration biodiversity generally relies on regional surveys and our aim to investigate PMs in Taiwan. Collections fungi five species around agricultural environments were subjected morphological molecular characterization, using both internal transcribed spacer (ITS) β-tubulin gene (TUB2) regions ...

in this study, the relationship among four species of polygonum (including p. hyrcanicum (three samples), p. persicaria, p. avicular, and p. hydropiper) was investigated by gc profiling. furthermore, the major compounds of the ethylic ether extract of p. hyrcanicum were identified by gc/ms as: α-bisabolol (17.5%), cedrol (15.9%), sesquisabinene hydrate (13.0%), α-elemol (10.5%) and trans-longip...

Seed production is an important element of weed population dynamics, and persistence relies upon the soil seed bank. In 2017 2018, we studied relationship between aboveground dry biomass common species their production. Weeds were selected randomly in fields, surrounded plants with a porous net to collect shed seeds during growth season. Just before crop harvest, weeds harvested, plants’ weight...

Black gram (Vigna mungo L. Hepper), is an extensively studied food crop which is affected by many abiotic and biotic factors, especially diseases. The yield potential of Black gram is shallow due to lack of genetic variability and biotic stress susceptibility. Core biotic stress factors include mung bean yellow mosaic virus (MYMV), urdbean leaf crinkle virus (UCLV), wilt (Fusarium oxysporum) an...