Foliar Symptoms Caused by Potato mop-top virus on Potato Plants During Vegetative Propagation in Scotland and Their Association With Tuber Yield, Spraing and Tuber Infection

2010 ◽  
Vol 53 (2) ◽  
pp. 83-93 ◽  
Author(s):  
S. F. Carnegie ◽  
A. M. Cameron ◽  
M. McCreath
Keyword(s):  
Vegetative Propagation ◽  
Tuber Yield ◽  
Potato Plants ◽  
Tuber Infection ◽  
Foliar Symptoms ◽  
Potato Mop Top Virus

Total nitrogen concentration in leaves of potatoes (Solanum tuberosumL.) as an index of nutritional status

1976 ◽  
Vol 87 (2) ◽  
pp. 293-296 ◽  
Author(s):  
A. Gupta ◽  
M. C. Saxena
Keyword(s):  
Total Nitrogen ◽  
Tuber Yield ◽  
Critical Concentration ◽  
Nitrogen Concentration ◽  
Curvilinear Relationship ◽  
N Application ◽  
Total N ◽  
Potato Plants ◽  
N Concentration ◽  
Total Nitrogen Concentration

SummaryLeaf samples were collected, at weekly intervals, throughout the growing season, from potato (Solanum tuberosumL.) plants supplied with varying amounts of nitrogen (0, 60, 120, 180 and 240 kg N/ha) and analysed for total N. Application of nitrogen increased the N concentration in the green leaves at all stages of growth. There was a significant curvilinear relationship between the final tuber yield and the total N concentration in the leaves at 48–90 days after planting in 1968–9 and at 79–107 days after planting in 1969–70. The N concentration at 70–90 days after planting was consistently related to the final tuber yield in both years. Thus this period was ideal for assessing the nitrogen status of potato plants. The critical concentration of total nitrogen generally decreased with advance in age. It ranged from 4·65% at 76 days to 3·30% at 90 days during 1968–9, whereas in 1969–70 it ranged from 4·20% at 79 days to 3·80% at 93 days. During the period from 83 to 86 days the critical percentage was around 3·6% in both the years.

scholarly journals Herbicide Evaluation for Sweet Potatoes

1969 ◽  
Vol 66 (4) ◽  
pp. 254-260 ◽  
Author(s):  
Lii-Chyuan Liu ◽  
Edwin Acevedo-Borrero ◽  
F. H. Ortiz
Keyword(s):  
Weed Control ◽  
Sweet Potato ◽  
Tuber Yield ◽  
Potato Cultivar ◽  
Weed Competition ◽  
Sweet Potatoes ◽  
Minimum Rate ◽  
Potato Plants ◽  
Herbicide Treatments ◽  
Rate Controlled

Two herbicide experiments were carried out in 1980 to evaluate Alachor and Metribuzin alone or combined for weed control in sweet potato cultivar Miguela at the Isabela and Fortuna Substations, Metribuzin at 1.12 kg ai/ha rate controlled effectively both broadleaf weeds and grasses. A minimum rate of 6.73 kg ai/ha of Alachor was needed for acceptable weed control. Metribuzin at the 1.12 kg al/ha rate in combination with Alachor at the 3.36 kg ai/ha rate provided the best weed control. There was no visible herbicide injury to sweet potato plants at the Isabela Substation. Moderate crop injury as a consequence of Metribuzin application at 2.24 kg ai/ha was apparent at the Fortuna Substation. The highest tuber yield was obtained with Metribuzin at 1.12 kg ai/ha in combination with Alachor at 3.36 kg ai/ha at both Substations. Metribuzin at 1.12 kg ai/ha rate alone or in combination with any other herbicide also produced good tuber yield. Sweet potatoes with standard herbicide treatments, Diphenamid and Chloramben, yielded poorly because of weed competition.

scholarly journals Molecular studies of Potato mop-top virus (PMTV) in transgenic N. benthamiana and S. tuberosum

2002 ◽  
Vol 38 (SI 1 - 6th Conf EFPP 2002) ◽  
pp. 183-185
Author(s):  
A. Germundsson ◽  
M. Sandgren ◽  
H. Barker ◽  
E.I. Savenkov ◽  
J.P.T. Valkonen
Keyword(s):  
Nicotiana Benthamiana ◽  
Transgenic Potato ◽  
Infested Soil ◽  
Systemic Movement ◽  
Potato Plants ◽  
Cp Gene ◽  
Molecular Studies ◽  
Infested Field ◽  
Transgenic Potato Plants ◽  
Potato Mop Top Virus

Resistance to Potato mop-top virus (PMTV) was studied in Nicotiana benthamiana and potato (Solanum tuberosum cv.<br />Saturna) transformed with the coat protein (CP) gene of PMTV. In N. benthamiana plants mechanically inoculated with<br />PMTV, RNA2 was detected in leaves and roots in several plants in the absence of RNA3. When N. benthamiana was<br />grown in infested soil, viral RNA was detected in roots, but no systemic movement of PMTV to above-ground parts was<br />observed. The incidence of PMTV infections was reduced in the CP-transgenic potato plants grown in an infested field<br />in Sweden. However, in infected tubers, all three virus RNAs were detected.

Changes in GA 20-oxidase gene expression strongly affect stem length, tuber induction and tuber yield of potato plants

2000 ◽  
Vol 22 (3) ◽  
pp. 247-256 ◽  
Author(s):  
Esther Carrera ◽  
Jordi Bou ◽  
Jose Luis Garcia-Martinez ◽  
Salome Prat
Keyword(s):  
Gene Expression ◽  
Tuber Yield ◽  
Stem Length ◽  
Oxidase Gene ◽  
Tuber Induction ◽  
Potato Plants

Tuber yield and allocation of nutrients and carbohydrates in potato plants as affected by limestone type and magnesium supply

2019 ◽  
Vol 43 (1) ◽  
pp. 51-63
Author(s):  
Natália S. Assunção ◽  
Nathalia P. Ribeiro ◽  
Rudieli M. da Silva ◽  
Rogério P. Soratto ◽  
Adalton M. Fernandes
Keyword(s):  
Tuber Yield ◽  
Potato Plants

scholarly journals Impact of potato psyllid density and timing of infestation on Zebra chip disease expression in potato plants

2016 ◽  
Vol 52 (No. 4) ◽  
pp. 262-269 ◽  
Author(s):  
Gao Feng ◽  
Zhao Zi-Hua ◽  
Jifon John ◽  
Liu Tong-Xian
Keyword(s):  
Tuber Yield ◽  
Potato Crop ◽  
Growth Stages ◽  
Potato Psyllid ◽  
Zebra Chip ◽  
Potato Plants ◽  
Zebra Chip Disease ◽  
Crop Development ◽  
The Impact ◽  
Different Growth Stages

The impact of vector density and timing of infestation on potato were investigated. Healthy potato plants at different growth stages (4, 5, and 7 weeks after germination) were exposed separately to four different B. cockerelli densities (0, 5, 20, and 40 psyllids per cage) in field cages and Zebra chip (ZC) symptoms, leaf photosynthetic rates, tuber yield, and total nonstructural carbohydrate accumulation in leaves and tubers of healthy and B. cockerelli-infested plants were monitored. Potato psyllid nymph and egg populations reached a seasonal peak at 6 weeks after the exposure to insect. Younger plants at 4-week growth stage after germination were more susceptible to B. cockerelli infestation and ZC expression than older plants. As few as five B. cockerelli adults were enough to transmit the ZC pathogen and cause ZC expression both in foliage and tuber. At the density of 20 psyllids per cage, more than 50% of plants showed ZC symptoms in tubers. Furthermore, B. cockerelli infestation reduced leaf photosynthesis rates (P<sub>n</sub>), resulting in less starch and more reducing sugars in tubers, and hence reduced tuber weight and yield, especially when psyllid infestation occurred at the early growth stages. The results indicate that early B. cockerelli infestation of younger plants was associated with more severe ZC expression in both foliage and tubers, leading to earlier dead plants. The data suggest that strategies for controlling B. cockerelli during early potato crop development could thus lessen the severity of ZC development.

scholarly journals The effect of potato rugose on the yield of some potato varieties

1961 ◽  
Vol 33 (1) ◽  
pp. 89-100
Author(s):  
Onni Pohjakallio ◽  
Laura Karhuvaara ◽  
Simo Antila
Keyword(s):  
Virus Infection ◽  
Potato Virus ◽  
Potato Plant ◽  
Potato Virus Y ◽  
Tuber Yield ◽  
Virus Disease ◽  
Potato Varieties ◽  
Potato Plants ◽  
Severe Type

The virus disease occurring in the potato varieties Harbinger, Aquila, and King George V was probably the potato rugose caused by potato virus Y (Solanum virus 2). In the variety Harbinger, the degree of strength of the virus disease probably varied as a result of the appearance of different races of potato virus Y. The type of the virus disease did not change from one vegetative generation of the potato to another. In the potato varieties Aquila and King George V, only the severe type of the disease was observed. The severe type of the virus disease reduced the tuber yield of all the potato varieties investigated to a level of 5 to 6 %, and the slight type occurring in the variety Harbinger to an average of 27 % of the normal. The virus infection appeared more frequently in Harbinger than in the variety Aquila. In the summer, when the infection of the potato plant took place, the virus disease reduced its productivity only relatively little. In the following vegetative generation of the diseased potato plants, the degree of their degeneration conclusively displayed itself. Following this, the wakening of the virus diseased plants did not progress further from one vegetative generation to the next.

Effects of a Prototype Pneumatic Machine to Control the Colorado Potato Beetle on Potato Plant Growth and Tuber Yield

2021 ◽  
Vol 64 (6) ◽  
pp. 2035-2044
Author(s):  
Saad Almady ◽  
Mohamed Khelifi
Keyword(s):  
Plant Growth ◽  
Colorado Potato Beetle ◽  
Tuber Yield ◽  
Control Method ◽  
Insect Pest ◽  
Pneumatic Control ◽  
Potato Plants ◽  
Potato Beetle ◽  
Biological Insecticide ◽  
Leptinotarsa Decemlineata Say

HighlightsA prototype pneumatic machine used to control the Colorado potato beetle (CPB) had no effect on potato plant growth.Yields in pneumatic treatment plots were comparable to those of control plots treated with a biological insecticide.Pneumatic control of the CPB could be an alternative to reduce reliance on chemical insecticides in potato fields.Abstract. The Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say), is the major insect pest of potato plants. Currently, the most effective method for controlling the CPB is to apply chemical insecticides throughout its lifecycle. However, the CPB has the ability to resist most chemical insecticides. Control of this insect pest has therefore become extremely difficult, prompting researchers to explore effective alternatives. The use of pneumatic methods to control the CPB is a promising alternative to chemical means. The objective of this study was to develop an effective pneumatic control method for the CPB to reduce the reliance on chemical insecticides in potato fields. In this context, a prototype pneumatic machine was designed and built. The prototype uses positive air pressure to dislodge CPBs from potato foliage, deposit them on the ground between the rows, and crush them. The effects of three airflow velocities (45, 50, and 55 m s-1) and two tractor travel speeds (5 and 6 km h-1) on CPB control, plant growth, and tuber yield were investigated in potato plots. Overall, the results showed no significant differences in yield between treatments (p = 0.3268), indicating that the yield of potato plants treated with the prototype was comparable to that of plants treated with a biological insecticide (Entrust). In addition, the prototype did not have any negative effects on plant growth. This suggests that the prototype could be safely and efficiently used in potato fields to control the CPB. The success of this innovative control method could greatly contribute to reducing the use of chemical insecticides to control the CPB. Keywords: Airflow velocity, Leptinotarsa decemlineata (Say), Pneumatic control, Potato, Travel speed.

scholarly journals Seed Potato Growth and Yield as Affected by Mother Plant Exposure to Herbicides

2017 ◽  
Vol 31 (1) ◽  
pp. 136-147 ◽  
Author(s):  
Jed B. Colquhoun ◽  
Daniel J. Heider ◽  
Richard A. Rittmeyer
Keyword(s):  
Seed Potato ◽  
Tuber Yield ◽  
Mother Plant ◽  
Plant Production ◽  
Growth And Yield ◽  
Tuber Quality ◽  
Tuber Growth ◽  
Potato Plants ◽  
Mother Plants ◽  
Daughter Tuber

In a repeated multi-year study, mother potato plants were exposed to herbicides at rates that simulated off-target application, such as through tank contamination. Following exposure of mother plants to herbicides, seed from mother plants was planted in the following growing season and crop growth, yield and tuber quality were quantified. Visual injury from herbicides was observed both in the mother plant and daughter tuber growing seasons and occasional impacts on tuber yield were noted. However, an inconsistent relationship was observed for herbicide related injury and tuber yield reductions of mother potato plants with daughter tuber growth and yield. The lack of consistency in the relationship between visual potato injury in the mother plant production and adverse daughter tuber growth and yield in the following year challenges traditional crop scouting as a tool to predict off-target herbicide risk near seed potato production.

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