Preliminary evaluation of some soil disin-festants for controlling southern bacterial wilt of potatoes

Nielsen, L. W.; Todd, F. A.

doi:10.1007/bf02863305

Cited by 5 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When urea and mineral ash (with 44% CaO) were combined, the effect was the same as in the original S-H mixture. In field experiments in North Carolina, amending the soil with lime and urea did significantly reduce the number of bacterial wilted potatoes (Nielsen & Todd, 1945). However, liming alone had no effect while urea alone was not tested.…”

Section: Discussionmentioning

confidence: 92%

“…While the use of soil amendment (SA) has been studied in the field for control of bacterial wilt of potato (Nielsen & Todd, 1945;Elphinstone & Aley, 1993) and tobacco (Smith, 1944), little is known for tomato and existing data mainly refer to laboratory and greenhouse experiments (Sun & Huang, 1985;Chang & Hsu, 1988;Hsu & Chang, 1989). For our research, the SA formulated by Elphinstone & Aley (1993), based on the S-H mixture developed by Sun & Huang (1985), was used to avoid contamination of soil with aluminium oxide, an important component of the S-H mixture (more than 10%).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of intercropping and soil amendment with urea and calcium oxide on the incidence of bacterial wilt of tomato and survival of soil‐borne Pseudomonas solanacearum in Taiwan

et al. 1997

View full text Add to dashboard Cite

Intercropping and soil amendment experiments were conducted to determine if they reduced populations of Pseudomonas solanacearum and bacterial wilt of tomato at the Asian Vegetable Research and Development Center (AVRDC) and at three other locations in Taiwan. At AVRDC, intercropping tomato with cowpea planted within the row significantly reduced bacterial wilt (P < 0.05) compared to when tomato was cropped alone. The P. solanacearum population in soil was not affected by intercropping with cowpea, soybean, or Welsh onion.At the same site, however, a preplanting soil amendment consisting of urea (200 kg ha−1 N) and CaO (5000 kg ha−1) significantly reduced the pathogen population and tomato bacterial wilt (P < 0.001). The effect of the soil amendment was not consistent when applied to soil from three other sites in Taiwan; in soil from two sites no reduction of the pathogen population occurred. At these sites, tomato bacterial wilt in the field was not reduced significantly after amending. In comparison with a non‐amended control, the addition of only CaO reduced the P. solanacearum population in AVRDC soil significantly (P < 0.05), but the reduction was significantly greater when the complete soil amendment was added. In contrast, urea alone did not affect the survival of P. solanacearum in the soil. In a greenhouse experiment with AVRDC soil, P. solanacearum was undetectable 2 weeks after soil amendment, but in the same treatment tomato yield was significantly reduced by 48% (P < 0.05) compared with non‐amended treatments. The suppressive effect of the soil amendment on the P. solanacearum population was probably due to the generation of one or several toxic substances during the transformation of urea in the presence of CaO.

show abstract

Section: Discussionmentioning

confidence: 92%