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The agronomical characteristics of 14 induced pepper accessions from Korea were evaluated in spring-summer in 2015 at Thua Thien Hue in order to select pepper lines having high yield and good adaptation under local conditions for introducing new cultivar to enhance plant productivity and quality. Most of the accessions showed growth duration suitable to cropping pattern in Thua Thien Hue. Large variation in agronomical characteristics, such as plant height, number of leaves and branches, stem and flower color and fruit shape were observed among these induced pepper accessions. Plant height of all induced pepper accessions was higher than control check, ranging from 49.2 cm to 105.0 cm. YT2-1 had the highest fruit set rate (80.38%). All pepper accessions had higher yield compared with the control check (1.42 tons/ha), ranging from 3.71 tons/ha (YT4-1) to 28.34 tons/ha (YT4-3). YT1-2 had good characteristics and good quality. YT1-1 showed high resistance to insects and diseases. These accessions are potentially useful for breeding programme.

Sponge gourd varieties having aroma after cooking have been degenerated because of cross pollination. Collection and evaluation of sponge gourd germplasm are needed for conservation and breeding of high quality varieties. The objective of the study was to identify varieties having high yield, good quality and aroma under local conditions. Ten promising sponge gourd accessions, including A2, A6, A7, A13, A16, A17, B29, B30, HN and QN were evaluated for growth, morphological traits, fruit quality and yield. The experiment was carried out in Hue University of Agricultural and Forestry from June to October in 2014. The results showed that all promising accessions grew well. Different morphological traits were observed among promising lines. Yield of accessions A7, A13 and A17 were higher than the others. Only fruits of accession B29 had aroma after cooking. These lines can be used in sponge gourd breeding programs.

The four F1 hybrid tomato lines (CT2011, CW2011, TS2011, and CLN2011) and two commercial F1 hybrid tomato cultivars used as control (TN52 and TN561) were evaluated for yield and yield components. The efforts were made to minimize reliance on the import of hybrid seed. The experiment was laid out in randomized complete block design (RCBD) with three replications in spring-summer season 2015. Data was recorded on five plants for each replication. The results indicated that all of F1 tomato hybrid lines grew well under Thua Thien Hue condition. CT2011 had the highest plant height, followed by TS2011 and CLN2011. CT2011 is a cherry type and obtained the highest percentage of fruit setting (82.87%) and the highest of Brix (4.97). This line also had high yield (70.91 tons/ha). TN52 had the highest yield (80.69 tons/ha) among the processing tomato lines, and TN561 had the biggest fruit (90.1 g). All of F1 hybrid tomato lines had high resistant level to late blight and bacterial wilt diseases.

In the present study, the authors studied the interaction between 26 monogenic differentials carrying 26 blast resistance genes with 15 isolates of Pyricularia oryzae under field conditions and pathogenicity assays. The result in field conditions showed that area under disease progress curves (AUDPC) of monogenic lines was found to range from 0 to 142.3. Lijiangxintuanheigu (LTH) was susceptible in all of regions. The monogenic lines carrying Pik, Pik-p, Pik-h, Piz, Pi1, Pi7(t), Pik-m, Pi4(t), Pish, Pi9(t) and Pita were highly resistant to blast in all of regions. In plastic house net conditions, the percentage of virulent reactions of monogenic lines to 15 isolates was found to range from 23.1% to 84.6%. LTH was susceptible to all 15 isolates. All 26 monogenic lines were resistant to at least 3 isolates of P. oryzae, and the frequency of resistant reactions of the monogenic lines carrying Pik, Pik-p, Pik-h, Piz, Pi4(t), Pish, Pi1, Pi7(t), Pi9, Pik-m and Pita were 80.0%, 93.3%, 93.3%, 80.0%, 73.3%, 86.7%, 73.3%, 80.0%, 80.0%, 80.0% and 80.0%, respectively. These findings suggest that Pik, Pik-p, Pik-h, Piz, Pi4(t), Pish, Pi1, Pi7(t), Pi9, Pik-m and Pita may be important R genes for preventing blast disease in South Central Vietnam. Based on these data, a useful strategy for managing rice blast disease by stacking pyramiding blast R genes against pathogenic P. oryzae isolates at hotspot in South Central Coast of Vietnam was proposed.

Five lines of introduced pepper obtained from National Institute of Horticultural and Herbal Science, Korea, namely YT1, YT2, YT3, YT4, KR1, and two local varieties, namely Chia Voi and Moi, were used in this study to evaluate bio-agronomy characteristics and yield components in summer-autumn season 2014 at Thua Thien Hue, Vietnam. The experiment was laid out in a random complete block design (RCBD) with three replications. The results showed that all of the introduced pepper accessions can grow under Thua Thien Hue condition. The introduced accessions as KR1, YT2 and YT4 showed good adaptability. These pepper lines had high yield and good fruit qualities, like Chia Voi. YT4 gave high number of leaves and plant height. Accession KR1 had the highest number of fruits per plant and yield (1397.8 kg/ha). Accession YT2 had high fruit setting rate and the biggest fruit (8.08 g). YT2 and YT4 had high yield, which were equivalent to Chia Voi. These accessions need to be conducted another trials in different areas and seasons to confirm their growth ability and can be used in crop structure at Thua Hien Hue province and breeding programs.