Chemical and biological control of Rhizoctonia solani on potato seed tubers

1995 ◽  
Vol 35 (5) ◽  
pp. 661 ◽  
Author(s):  
TJ Wicks ◽  
B Morgan ◽  
B Hall
Keyword(s):  
Biological Control ◽  
Rhizoctonia Solani ◽  
Sodium Hypochlorite ◽  
Spore Suspension ◽  
Potato Seed ◽  
Verticillium Biguttatum ◽  
Seed Tubers ◽  
Biological Treatments

Chemical and biological treatments for the control of tuber-borne inoculum of R. solani on potatoes were evaluated by testing the viability of sclerotes removed from treated tubers. This technique showed that most sclerotes adhering to the tuber surface were devitalised when tubers were dipped for 20 min in a 2% solution of formaldehyde. Dusting tubers with toclofos-methyl, or spraying them with fenpiclonil or pencycuron, gave control equal to formaldehyde, whereas a sodium hypochlorite dip was ineffective. A spore suspension of Verticillium biguttatum applied to tubers as either a dip or a spray devitalised >90% of treated sclerotes, whereas similar treatments of other organisms such as Bacillus, Gliocladium, and Trichoderma were ineffective.

scholarly journals The yield of potato plants as affected by stem canker (Rhizoctonia solani), blackleg (Erwinia carotovora subsp. atroseptica) and by neighbouring plants

1996 ◽  
Vol 126 (4) ◽  
pp. 429-440 ◽  
Author(s):  
G. A. Hide ◽  
S. J. Welham ◽  
P. J. Read ◽  
A. E. Ainsley
Keyword(s):  
Rhizoctonia Solani ◽  
Field Experiments ◽  
Tuber Yield ◽  
Erwinia Carotovora ◽  
Stem Canker ◽  
Potato Seed ◽  
Size Distributions ◽  
Potato Plants ◽  
Seed Tubers ◽  
Yield Gaps

SUMMARYPotato seed tubers inoculated with Rhizoctonia solani and Erwinia carotovora subsp. atroseptica, to induce stem canker and blackleg respectively, were planted with uninoculated seed tubers in field experiments designed to measure the effects of the diseases and of neighbouring plants on tuber yield. Gaps were also included. The plant variables total and ware (> 150 g) yields and tuber numbers were affected by disease, and also by competition from the two plants on either side in the same row (first neighbours), and increased as competition from neighbouring plants decreased. Plants adjacent to the first neighbours also influenced yields of plants with stem canker but those in adjacent rows did not have a significant effect with either disease. Both diseases altered the tuber size distributions, which were also modified by neighbouring plants. The data were used to predict total and ware yields for crops containing different proportions of healthy, diseased and missing plants.

scholarly journals Detecting Migrants in Populations of Rhizoctonia solani Anastomosis Group 3 from Potato in North Carolina Using Multilocus Genotype Probabilities

2003 ◽  
Vol 93 (5) ◽  
pp. 610-615 ◽  
Author(s):  
Paulo C. Ceresini ◽  
H. David Shew ◽  
Rytas J. Vilgalys ◽  
Liane Rosewich Gale ◽  
Marc A. Cubeta
Keyword(s):  
North Carolina ◽  
Rhizoctonia Solani ◽  
Anastomosis Group ◽  
Potato Seed ◽  
Human Populations ◽  
Source Population ◽  
Multilocus Genotype ◽  
Seed Tubers ◽  
Genetic Diversity And Structure ◽  
Group 3

The relative contribution of migration of Rhizoctonia solani anastomosis group 3 (AG-3) on infested potato seed tubers originating from production areas in Canada, Maine, and Wisconsin (source population) to the genetic diversity and structure of populations of R. solani AG-3 in North Carolina (NC) soil (recipient population) was examined. The frequency of alleles detected by multilocus polymerase chain reaction-restriction fragment length polymorphisms, heterozygosity at individual loci, and gametic phase disequilibrium between all pairs of loci were determined for subpopulations of R. solani AG-3 from eight sources of potato seed tubers and from five soils in NC. Analysis of molecular variation revealed little variation between seed source and NC recipient soil populations or between subpopulations within each region. Analysis of population data with a Bayesian-based statistical method previously developed for detecting migration in human populations suggested that six multilocus genotypes from the NC soil population had a statistically significant probability of being migrants from the northern source population. The one-way (unidirectional) migration of genotypes of R. solani AG-3 into NC on infested potato seed tubers from Canada, Maine, and Wisconsin provides a plausible explanation for the lack of genetic subdivision (differentiation) between populations of the pathogen in NC soils or between the northern source and the NC recipient soil populations.

Age of potato seed-tubers influences protein synthesis during sprouting

1993 ◽  
Vol 89 (2) ◽  
pp. 262-270 ◽  
Author(s):  
G. N. Mohan Kumar ◽  
N. Richard Knowles
Keyword(s):  
Protein Synthesis ◽  
Potato Seed ◽  
Seed Tubers

scholarly journals Effect of Plant Extracts and Biological control agents on Rhizoctonia solani Kuhn

2021 ◽  
Vol 735 (1) ◽  
pp. 012079
Author(s):  
Muneer Saeed M. Al-Baldawy ◽  
Ahed A A H Matloob ◽  
Mohammed K. N. Almammory
Keyword(s):  
Biological Control ◽  
Rhizoctonia Solani ◽  
Plant Extracts ◽  
Biological Control Agents

Determination of optimum tuber planting density in the potato varieties Pentland Squire, Cara, Estima, Maris Piper and King Edward

1992 ◽  
Vol 119 (1) ◽  
pp. 35-44 ◽  
Author(s):  
D. C. E. Wurr ◽  
J. R. Fellows ◽  
E. J. Allen
Keyword(s):  
Complex Analysis ◽  
Seed Tuber ◽  
Tuber Size ◽  
Planting Density ◽  
Potato Seed ◽  
Stem Density ◽  
Seed Tubers ◽  
Net Returns ◽  
Analysis Technique ◽  
The Cost

SummaryThirty-two experiments examining the effects of the weight and within-row spacing of potato seed tubers on graded tuber yields of five varieties were conducted on eight sites from 1980 to 1985. A complex analysis technique was used to combine these data and estimate the optimum tuber planting densities for different ratios of seed cost to small (40–60 mm) and large (60–80 mm) ware value. The same technique could be applied to any other combination of seed cost, ware size and ware value.The optimum tuber planting density decreased with increasing seed-tuber weight. Differences in optimum planting density between varieties were much greater with small (35 g) than with large (105 g) seed tubers and decreased as the cost of seed increased relative to the value of ware. As large ware became worth more than small ware the influence of increasing seed cost on the optimum density was reduced. As the value of large ware increased, net returns increased and the effect of seed cost on net returns was reduced. Mean tuber size decreased with increasing stem density at harvest and at the same stem density was lower in varieties producing more daughter tubers/stem. Changes of mean tuber size (μ) and the spread of yield across size grades (σ) with time were well described by parallel curves in different varieties. It is suggested that in future it may not be necessary to determine optimum tuber planting densities by complex experiments involving several seed-tuber weights and spacings. Instead μ and σ could be estimated from simple experiments and tuber spacings determined by comparison with control varieties.

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