Sheng-Jun Xu

• Institute of Plant Protection, Gansu Academy of Agricultural Sciences

Astragalus mongholicus is a perennial Chinese medicinal herb in the family Leguminosae widely cultivated in China. In September 2023, A. mongholicus plants in a field in Weiyuan County, Gansu Province, showed symptoms of circular or irregular brown, sunken and necrotic lesions, multiple lesions coalesced, and brown longitudinal cracks in the roots....

Lanzhou lily (Lilium davidii var. unicolor) is the only famous sweet lily variety that has high edible, medicinal and ornamental value in China, which is mostly planted in the middle areas of Gansu Province in China. In recent years, severe yellowing and wilting of leaves, stem wilt, root and bulb rot symptoms were observed on Lanzhou lily in Qilih...

The aim of the present study was to screen native cultivable rhizobacteria with potential applications for biocontrol of root rot, which results in a serious and persistent disease problem for the pepper industry worldwide and is difficult to control through chemical and agricultural means. A total of 47 bacteria were isolated from pepper rhizosphe...

Onion (Allium cepa L.) is one of the most important cultivated vegetable crops in many countries, including China (Hanci 2018; Steentjes et al. 2021). Gansu, in the northwest region of China, is a major area of onion production (Zhang et al. 2022). In October 2021, typical symptoms of neck rot were observed on stored onion bulbs (cv. Honghe) in Jiu...

Paeoniae radix Rubra is a traditional Chinese herbal medicine, which has the effect of clearing heat and cooling blood, activating blood and removing stasis. It has become popular in the Chinese market in recent years due to its extremely high medicinal value and showy flower color. In May 2021, typical symptoms of root rot were observed in a field...

Barbary wolfberry (Lycium barbarum L.) is a well-known edible and medicinal plant, widely grown in northwest China (Gao et al. 2021). During the summer of 2019, typical anthracnose symptoms were observed on fruits of barbary wolfberry in Baiyin, Gansu province, China. Approximately 30% of the barbary wolfberry fruits had typical anthracnose symptom...

Phytophthora blight is the most devastating disease for pepper (Capsicum annuum L.) production and is caused by Phytophthora capsici. Current management strategies are not effective. Our study assessed the multi-trait effects of Paenibacillus polymyxa, which suppresses Phytophthora blight and promotes plant growth in pepper plants. A total of 82 ba...

Bacillus strains SG08-09 and SG09-12 were isolated from soil samples collected in garlic fields and screened against Botrytis cinerea, which causes gray mold disease, through dual culture and seedling assays. The effectiveness of these strains as biocontrol agents and their abilities to promote tomato plant growth were evaluated both in the laborat...

Japanese spiraea (Spiraea japonica L.f., Rosaceae) is native to Japan, China, and Korea. It is naturalized throughout North America and Europe and has the potential to become an invasive weed (Wilson and Hoch 2009). Nevertheless, many varieties are widely planted for their ornamental value worldwide. In May 2014, several hundred plantings (cv. Hwan...

In February 2014, gray mold rotting symptoms were observed in carrots in cold storage at Gangneung, Gangwon province, Korea. The typical symptom of gray mold rot showed abundant blackish gray mycelia and conidia was observed on the infected root. The pathogen was isolated from infected root and cultured on PDA for further fungal morphological obser...

In this study, bacterial strains were isolated from soils from 30 locations of Samcheok, Gangwon province. Of the isolated strains, seven showed potential plant growth promoting and antagonistic activities. Based on cultural and morphological characterization, and 16S rRNA gene sequencing, these strains were identified as Paenibacillus species. All...

In this study, we identified the causative agent of stem-end rot in potatoes that were grown in Gangwon alpine areas of Korea in 2013. The disease symptoms included appearance of slightly sunken circular lesion with corky rot on the potato surface at the stem-end portion. The fungal species isolated from the infected potatoes were grown on potato d...

Datura metel Linn. (Thorn apple: Devil's trumpet, Solanaceae) has been extensively used for various medicinal purposes throughout the world. Due to the presence of many bioactive compounds, the plants widely used in traditional medicine to cure diseases such as asthma, cough, convulsion etc. In the summer season of 2013, serious leaf spots symptoms...

Carrots (Daucus carata L.) are biannual crop under the Apiaceae (Umbelliferae) family. The edible portion is the storage taproot, which contains high levels of carbohydrates (sugars) and ß-carotene (pre-vitamin A). In February 2014, rotting symptoms were observed in carrots in cold storage at Ganwon-Do, Korea. The symptoms observed were abundant bl...

In 2013, Anthracnose symptoms were observed on sweet pumpkin fruit in Gangneung, Gangwon in Korea. The typical symptoms on fruit surfaces were circular lesions, brown, shriveled with salmon-colored spore masses on the spots. A fungal isolate was obtained from symptomatic on fruit and cultured on potato dextrose agar (PDA) at 25℃. The color of the u...

In 2013, gray mold symptoms were frequently observed on red raspberry (Rubus idaeus L.) in Gangnueng, Gangwon Province in Korea. The typical symptoms were dark brown lesions covered with green-gray spore masses appeared on twigs, blossoms, leaves and fruit. Lesions expanded rapidly under cool, humid condition. A fungal isolate was obtained from sym...

The bacterial strain T-9, which shows strong antifungal activity, is isolated from the soils of Samcheok, Gangwondo and identified as Paenibacillus kribbensis according to morphological and taxonomic characteristics and 16S rRNA gene sequence analysis. The P. kribbensis strain T-9 strongly inhibits the growth of various phytopathogenic fungi includ...

Recently, Cucumber mosaic virus (CMV)-P1 infection in pepper cultivation is very serious problem, which causes low marketability and yield. In this research, 56 domestic pepper cultivars including 20 PR (Phytophthora resistance) cultivars, 31 foreign pepper lines collected from USA and 112 genetic pepper resources form RDA Genebank were used for CM...

Late blight, caused by the oomycete Phytophthora infestans, is a destructive disease of potato in Korea and worldwide. Because of the lack of resistant cultivar, chemical control is still the main measures for the disease management. The objective of this research was to evaluate different fungicide spray programs to manage systemic infections of l...

This specific research was executed to select beneficial antagonists from digestive organs of Allomyrina dichotoma larva that can be put on environment friendly control against phytopathogenic fungi. A total of 111 strains of gut microbes were isolated from digestive organs and evaluated antifungal effects against various phytopathogens in vitro. T...

Seven bacterial strains screened from soils of Chinese cabbage, garlic and paddy fields at 30 regions of Samcheok, Gangwon province showed potential plant growth promoting (PGP) and antagonistic activities. Based on 16S rRNA gene sequence analysis, strains SC09-21, SR04-02 and SR04-16 were identified as P. polymyxa, strains SC02-09, SG09-01 and SG0...

This experiment was carried out to select potential soil microorganisms that can be applied to environment friendly control against Kimchi cabbage bottom rot. Totally 1,362 strains were obtained from the soils of Kimchi cabbage, garlic and paddy fields in 30 regions of Samcheok, Gangwon province and examined antifungal effect against Rhizoctonia so...

This study was conducted to select potential soil microorganisms that can be applied to environment friendly control against phytopathogenic fungi. One thousand three hundred sixty two strains were isolated from the soils of Chinese cabbage, garlic and paddy fields in 30 regions of Samcheok, Gangwon province and evaluated antifungal effects against...

Powdery mildew and root-knot nematode are very important diseases occurred in cucurbits. This study was conducted to evaluate the resistance of commercial cucurbit cultivars (21 cultivars of cucumber, 9 cultivars of watermelon, 7 cultivars of oriental melon, and 2 cultivars of melon) to powdery mildew and root-knot nematode. At 60 days after transp...

Powdery Mildew and root-knot nematode are very important diseases occurred in cucurbits. This study was carried out to evaluate the resistance of cucurbit cultivars (21 cultivars of cucumber, 9 cultivars of watermelon, and 9 cultivars of melon) commercialized in Korea. At 60 days after planting, disease severity of powdery mildew of cucumber, water...

Seventy six isolates of Phytophthora infestans from North-West China was determined for the mating type, and an effective preservation method using mineral oil was developed. All P. infestans isolated had A1-mating type. When the isolated were stored in mineral oil, 94.9% of P. infestans isolates were viable. The composite fitness index of P. infes...