scholarly journals Growth Index and Disease Ratings of 55 Crape Myrtle Cultivars in Tennessee

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 660d-660
Author(s):  
W.T. Witte ◽  
M.T. Windham ◽  
R.J. Sauve ◽  
P.C. Flanagan
Keyword(s):  
Powdery Mildew ◽  
New Orleans ◽  
Drip Irrigation ◽  
Baton Rouge ◽  
Growth Index ◽  
Growing Season ◽  
World's Fair ◽  
Single Plant ◽  
Mean Width

Fifty-five accessions of commercially available crape myrtle cultivars were established with 10 single-plant replications during Fall 1993 and Spring 1994. Drip irrigation began on a regular basis May 1994 and plants were fertilized regularly. In contrast to the 1994 growing season with heavy powdery mildew infestation, little powdery mildew occurred in 1995. Mean growth index (GI = centimeter height + centimeter mean width) was calculated for each cultivar in Fall 1994 and 1995. Fastest growth occurred in `Tuskegee' and `Biloxi' (GI = 276, 246, respectively), followed by a group including `Tonto', `Comanche', `Choctaw', `Hardy Lavender', `Natchez', `Potomac', and `Tuscarora' (GI = 185 to 227). Slowest growth occurred in the group including `Pecos', `Seminole', `Baton Rouge', `Petite Orchid', `Bourbon Street', `Cherokee', `Monink Pink', `Moned Red', `Delta Blush', `Low Flame', `New Orleans', `Monow', and `World's Fair' (GI = 5 to 53). Data will be presented on powdery mildew ratings and physiological injury sustained during Winter 1995–96.

scholarly journals Growth Index and Disease Ratings of 60 Lilac Cultivars in Tennessee

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 660e-660
Author(s):  
W.T. Witte ◽  
M.T. Windham ◽  
R.J. Sauve ◽  
P.C. Flanagan
Keyword(s):  
Powdery Mildew ◽  
Drip Irrigation ◽  
Growth Index ◽  
Mean Width

Sixty accessions of commercially available lilac cultivars were planted May 1994 and immediately placed under drip irrigation and fertilized regularly. Powdery mildew appeared in July 1994 and was rated on a scale of 0 (healthy) to 5 (totally mildewed) in July, August, and September. Mean growth index (GI = cm height + cm mean width) was calculated for each cultivar in Fall 1994 and 1995. Fastest growth (GI = 75 to 45 respectively) occurred in the group including chinensis `Rothomagensis', meyeri `Dwarf Korean', reticulata `Ivory Silk', prestoniae `Isabella', `Mrs. Harvey Bickle', `Excel', `Katherine Havemeyer', `Mme. F. Morel', `Silver King', `Leon Gambetta', `Mount Baker', and microphylla `Superba'. Data will be presented on powdery mildew ratings for the 1995 season.

scholarly journals Powdery Mildew Observatios and Growth of Crapemyrtle in Teneessee

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 813A-813
Author(s):  
M.T. Windham ◽  
W.T. Witte ◽  
R.J. Sauve ◽  
P.C. Flanagan
Keyword(s):  
Powdery Mildew ◽  
Drip Irrigation ◽  
Single Plant ◽  
Group Of Seven

Fifty-five cultivars of crapemyrtle were established in a cultivar trial with 10 single-plant replications during Fall 1993 and Spring 1994. Drip irrigation began on a regular basis on 18 May 1994 and plants were fertilized regularly. Powdery mildew appeared in July, and within 2 to 3 weeks maximum levels of infection occurred. Plants were rated using a scale of 0 (healthy) to 5 (totally mildewed). In the group of seven cultivars, most heavily infected (>2.8 rating), `Byers Wonderful White' was worst (4.1), followed by `Royalty', `Pink Lace', `Prairie Lace', `Petite Plum', `Firebird', and `Christmastime'. There were 21 cultivars with no mildew (0.0). Many of these were USDA–NA hybrids but also included `Hope', `Bourbon Street', `Glendora White', `Petite Snow', `Centennial Spirit', and `Hardy Lavender'. A few USDA–NA hybrids had slight mildew: `Potomac', `Powhatan', `Catawba', `Seminole', `Biloxi', and `Hopi' (<10% of foliage mildewed).

Resource-saving Technologies and Some Proposals for the Creation of Automated Reclamation Systems

2021 ◽  
Vol 25 (7) ◽  
pp. 8-12
Author(s):  
Z.G. Lamerdonov ◽  
T.Yu. Khashirova ◽  
S.A. Zhaboev ◽  
L.Zh. Nastueva ◽  
A.А. Shogenov ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Salt Content ◽  
Experimental Studies ◽  
Soil Surface ◽  
Growing Season ◽  
Resource Saving ◽  
Water Savings ◽  
Irrigation Method ◽  
High Salt Content ◽  
Reclamation System

The results of experimental studies of the local subsurface irrigation method in comparison with drip irrigation carried out in the laboratory, which showed water savings due to a decrease in evaporation from the soil surface by 10–15 percent are presented. The method of irrigation in closed greenhouse farms using water with a high salt content is described. The paper proposes new patented schematic solutions for protecting plants from frost and pests, describes a multifunctional engineering and reclamation system capable of performing various operations depending on the emerging problems during the growing season.

scholarly journals INFLUENCE OF BIOLOGICAL PROTECTION OF PLANTS ON SOIL MYCOCENOSIS WHEN GROWING LEAF SALAD UNDER ARID CLIMATE OF ASTRAKHAN REGION

ÈKOBIOTEH ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 221-226
Author(s):  
D.G. Baubekova ◽  
Keyword(s):  
Biological Activity ◽  
Drip Irrigation ◽  
Plant Protection ◽  
Growing Season ◽  
Arid Climate ◽  
Phytopathogenic Bacteria ◽  
Agent Based ◽  
Air Temperatures ◽  
Biological Protection ◽  
Protection Agent

Territories with arid climate are characterized by insufficient atmospheric humidification at high air temperatures. Therefore, the use of drip irrigation during the growing season of plants is an effective agrotechnical method of farming. However, its use causes a number of unfavorable consequences that can be avoided by using biological plant protection agents with pronounced biological activity against phytopathogenic bacteria, micromycetes, insects and viruses. These remedies are based on the introduction of microorganisms and their metabolites into the biotechnological process. A biological plant protection agent based on Bаcillus atrophaeus ACIM В–11474 has been developed and its effect on the mycocenosis of the studied soils when growing lettuce in the arid climate of the Astrakhan region using drip irrigation has been studied.

scholarly journals Genetic Structure and Aggressiveness of Erysiphe necator Populations during Grapevine Powdery Mildew Epidemics

2008 ◽  
Vol 74 (20) ◽  
pp. 6327-6332 ◽  
Author(s):  
Josselin Montarry ◽  
Philippe Cartolaro ◽  
François Delmotte ◽  
Jérôme Jolivet ◽  
Laetitia Willocquet
Keyword(s):  
Powdery Mildew ◽  
Latency Period ◽  
Growing Season ◽  
Spore Production ◽  
Erysiphe Necator ◽  
Genetic Groups ◽  
Grapevine Powdery Mildew ◽  
Temporal Differentiation ◽  
Group A ◽  
Group B

ABSTRACT Isolates of the causal ascomycete of grapevine powdery mildew, Erysiphe necator, correspond to two genetically differentiated groups (A and B) that coexist on the same host. This coexistence was analyzed by investigating temporal changes in the genetic and phenotypic structures of E. necator populations during three epidemics. Group A was present only at the start of the growing season, whereas group B was present throughout all three epidemics. Group A was less aggressive in terms of germination and infection efficiency but was more aggressive than group B in terms of the latency period, lesion diameter, and spore production. Our results are consistent with a temporal differentiation of niches, preventing recombination, and suggest an association between the disease level and the frequencies of genetic groups.

Growth and Development of Wild Poinsettia (Euphorbia heterophylla) Selections in Peanut (Arachis hypogaea)

Weed Science ◽  
1996 ◽  
Vol 44 (3) ◽  
pp. 575-578 ◽  
Author(s):  
Barry J. Brecke ◽  
Piotr Tobola
Keyword(s):  
United States ◽  
Leaf Area ◽  
Growth And Development ◽  
Baton Rouge ◽  
Southeastern United States ◽  
Light Attenuation ◽  
Growing Season ◽  
The Other ◽  
Yield Reduction ◽  
Dry Biomass

Wild poinsettia is a serious weed in several crops, including peanut, grown in the southeastern United States. A study was conducted over 3 yr at Jay, FL, to characterize the growth and development of wild poinsettia grown from seed collected at Plains, GA; Marianna, FL; and Baton Rouge, LA. Seedlings from each selection were transplanted to the field and were grown either alone or in competition with peanut. Observations made throughout the growing season indicated that the Louisiana selection flowered later, grew to a larger size, produced more leaf area and biomass, and caused greater light attenuation and peanut yield reduction than the other two selections. The Georgia selection produced the smallest plants, least leaf area and biomass, and was least competitive with peanut. The Florida selection was intermediate for these parameters. Wild poinsettia dry biomass production was reduced by 78 to 83% when grown with peanut compared with monoculture wild poinsettia.

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