PHLOEM NECROSIS OF POTATO TUBERS IN RELATION TO LEAF-ROLL-FREE MYZUS PERSICAE SULC.

1950 ◽  
Vol 28c (3) ◽  
pp. 283-287 ◽  
Author(s):  
T. R. Davidson
Keyword(s):  
Myzus Persicae ◽  
Leaf Roll ◽  
Field Conditions ◽  
Potato Tubers ◽  
Phloem Necrosis

In experiments in which nonviruliferous colonies (25 to 50 individuals per plant) of Myzus persicae Sulc. were caged from 7 to 10 days on healthy potato vines growing under field conditions, the tubers failed to develop phloem necrosis. Under comparable conditions, the tubers from healthy plants caged with leaf-roll-infective colonies of this vector developed severe phloem necrosis. When planted, these tubers produced leaf-roll-infected plants.

OBSERVATIONS ON PHLOEM NECROSIS OF POTATO TUBERS

1944 ◽  
Vol 22c (4) ◽  
pp. 162-170 ◽  
Author(s):  
G. B. Sanford ◽  
J. G. Grimble
Keyword(s):  
Ultraviolet Light ◽  
Leaf Roll ◽  
Field Tests ◽  
Similar Type ◽  
Causal Agent ◽  
Potato Tubers ◽  
Phloem Necrosis ◽  
Net Necrosis

The results of field tests with random lots of potato tubers showing phloem necrosis of similar type are summarized. The vines from tubers of five of these developed typical leaf-roll symptoms, but those of three others showed no sign of leaf roll, or other symptoms that suggested a virus as the causal agent. The net necrosis in one of the latter samples was known to result from vine infestation of Paratrioza cockerelli Sulc, and in this case the stock returned to full vigour during the second season. It was further confirmed that once the vines show definite symptoms of leaf roll, the phloem elements of their tubers henceforth do not exhibit necrosis.The tissue contiguous to the necrotic phloem elements in the affected tubers was uniformly fluorescent, but the unaffected portion of such tubers, as well as non-necrotic tubers from positive leaf-roll plants, reacted negatively to ultraviolet light.

scholarly journals Diversité et abondance des pucerons [Homoptera : Aphididae] et leur impact sur la dissémination des virus infectant la pomme de terre au Mali

2014 ◽  
Vol 94 (1) ◽  
pp. 1-7
Author(s):  
Almouner A.A. Yattara ◽  
Amadou K. Coulibaly ◽  
Frédéric Francis
Keyword(s):  
Potato Virus ◽  
Myzus Persicae ◽  
Aphis Gossypii ◽  
Leaf Roll ◽  
Potato Leaf Roll Virus ◽  
Potato Leaf ◽  
Pomme De Terre

Des études sur l’abondance et la diversité des pucerons ont été menées pendant trois campagnes agricoles au Mali. Sur la base de relevés de bacs jaunes installés dans des cultures de pomme de terre à Kati et à Sikasso, 2 525 pucerons ont été capturés et identifiés. Dix-neuf espèces de pucerons ont été recensées, dont deux qui ont été observéesin situsur la culture :Aphis gossypii(Glover) etMyzus persicae(Sulzer). La plupart de ces espèces sont des ravageurs de cultures et elles contribuent également à la transmission virale. Des échantillons foliaires prélevés dans des parcelles de pomme de terre dans les deux régions ont été testés par la technique ELISA pour la détection des deux principaux virus dommageables, soit lePotato VirusY (PVY) et lePotato Leaf Roll Virus(PLRV). Le taux de plantes virosées dans les deux localités pendant les trois années variait de 19,3 % à 21,8 % pour le PVY, alors qu’il était de 8,5 % à 9,3 % pour le PLRV. L’occurrence de ces maladies virales s’est révélée être très homogène d’une année à l’autre, avec des taux relativement importants. Cette étude est une première quantification dans cette région du Mali de l’importance des relations pucerons vecteurs–virus en culture de pomme de terre.

scholarly journals Laboratory field studies of mini potato planter

2020 ◽  
Vol 17 ◽  
pp. 00150
Author(s):  
Nikolai P. Laryushin ◽  
Oleg N. Kukharev ◽  
Anton S. Bochkarev ◽  
Vladimir S. Bochkarev
Keyword(s):  
Field Studies ◽  
Field Conditions ◽  
Design Parameters ◽  
Small Scale ◽  
Potato Tubers ◽  
Motion Speed ◽  
Potato Planter

The paper considers the design and operation of the experimental mini potato planter for small-scale farms (private subsidiary farms – PSF). It presents the results of field studies of experimental potato planter in field conditions. The paper also describes probabilistic curves of potato tubers distribution in a furrow depending on motion speed and design parameters of tubers speed damper.

A MILD CHLOROSIS VIRUS OF PHYSALIS FLORIDANA FOUND IN A TURNIP LATENT VIRUS COMPLEX

1965 ◽  
Vol 43 (5) ◽  
pp. 509-518 ◽  
Author(s):  
J. P. MacKinnon
Keyword(s):  
Host Range ◽  
Myzus Persicae ◽  
Leaf Roll ◽  
Aphid Species ◽  
Latent Virus ◽  
Potato Leaf ◽  
Comparative Tests ◽  
Total Transmission ◽  
Virus Complex ◽  
Efficient Vector

Myzus persicae (Sulz.) transmitted a new virus to healthy Physalis floridana Rydb. from other P. floridana infected with a turnip latent virus complex. Symptoms were characterized by a chlorosis and sometimes cupping of only the lower leaves with slight stunting of plants. These symptoms could easily be mistaken for those incited by potato leaf roll virus but they were strikingly different from the yellow netting of plants infected with the turnip latent virus complex.In virus–vector studies with the new virus and M. persicae, an occasional aphid acquired the virus in 2 hours and 14% of infective insects transmitted it in 30 minutes. When acquisition and inoculation feedings were each increased to 48 hours, transmissions by single aphids of 70% and more were common. A few aphids transmitted the virus in a total transmission time of 30 hours, but most required 72 hours or longer to acquire, become infective, and transmit it.In comparative tests between the new virus and either potato leaf roll or the turnip latent complex, the new virus and potato leaf roll were recovered from plants 3 days after inoculation but the complex was not recovered for 14 days or longer. Of five aphid species tested, M. persicae was an efficient vector of all three viruses and the only species to transmit the new virus and the turnip latent complex. Plants infected with the new virus and showing symptoms were as easily infected with potato leaf roll as were comparable controls, but fewer of them became infected with the complex. The new virus and the complex were quite similar in host range, and susceptible plants were found in the Amaranthaceae, Chenopodiaceae, Cruciferae, and Solanaceae.The new virus is called mild chlorosis virus of P. floridana.

THE ISOLATION OF A BLUE FLUORESCENT COMPOUND SCOPOLETIN, FROM GREEN MOUNTAIN POTATO TUBERS, INFECTED WITH LEAF ROLL VIRUS

1948 ◽  
Vol 26c (1) ◽  
pp. 31-34 ◽  
Author(s):  
W. A. Andreae
Keyword(s):  
Tomato Spotted Wilt Virus ◽  
Leaf Roll ◽  
First Year ◽  
Potato Tubers ◽  
Green Mountain ◽  
Fluorescent Compound ◽  
Tobacco Plants ◽  
Tomato Spotted Wilt ◽  
Wilt Virus

A method has been described for the isolation of a crystalline fluorescent compound that occurs in Green Mountain potato tubers during the first year of infection with leaf roll virus. The substance was identified as 7-hydroxy-6-methoxy 1:2 benzopyrone (scopoletin), previously isolated by Best from tobacco plants, infected with tomato spotted wilt virus.

scholarly journals Potato Tubers Freed from Leaf-roll Virus by Heat

Nature ◽  
1949 ◽  
Vol 164 (4177) ◽  
pp. 881-881 ◽  
Author(s):  
B. KASSANIS
Keyword(s):  
Leaf Roll ◽  
Potato Tubers
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