Distribution of western and northern corn rootworms (Coleoptera: Chrysomelidae) in Quebec, Canada

2005 ◽  
Vol 137 (2) ◽  
pp. 226-229 ◽  
Author(s):  
François Meloche ◽  
Marc Rhainds ◽  
Michèle Roy ◽  
Jacques Brodeur
Keyword(s):  
Zea Mays ◽  
North America ◽  
Root System ◽  
Larval Feeding ◽  
Complete Development ◽  
Corn Rootworms ◽  
Root Injury ◽  
Emergent Adults ◽  
Soil Cracks

Corn rootworms, Diabrotica Chevrolat spp. (Coleoptera: Chrysomelidae), are major pests of corn, Zea mays L. (Poaceae), in North America. Overwintering eggs hatch in the spring, and larvae feed on the root system, where they complete development. Emergent adults feed on vegetative and reproductive aerial structures of corn and oviposit in soil cracks or at the base of plants. Although feeding on silks by adult corn rootworms reduces the yield of corn, most of the damage results from root injury caused by larval feeding (Levine and Oloumi-Sadeghi 1991).

EFFECT OF SPACING AND CLUMPING OF CORN PLANTS ON DENSITY OF CORN-ROOTWORM LARVAE (COLEOPTERA: CHRYSOMELIDAE) PER ROOT SYSTEM

1985 ◽  
Vol 117 (2) ◽  
pp. 139-142 ◽  
Author(s):  
Olga Piedrahita ◽  
C. R. Ellis ◽  
O. B. Allen
Keyword(s):  
Relative Density ◽  
Root System ◽  
Corn Rootworm ◽  
Plant Spacing ◽  
Corn Rootworms ◽  
Corn Plants ◽  
The Relationship ◽  
Field Plots

AbstractThe relative density of corn-rootworm larvae was estimated in two field plots with 4 different plant spacings and with up to 4 plants clumped per location. In both fields the relationship between plant spacing and the number of corn rootworms per sample was similar with the maximum number of larvae occurring when plants were 46 or 50 cm apart. The number of plants clumped per location affected the numbers of corn rootworm in only one field. The relationship between clumping of plants and number of corn rootworms was curvilinear in this field with the most corn rootworms occurring at 3 plants per location.

Spiroplasma kunkelii. [Distribution map].

2008 ◽  
Author(s):  
Keyword(s):  
Zea Mays ◽  
North America ◽  
South America ◽  
Central America ◽  
Geographical Distribution ◽  
Distribution Map ◽  
Mato Grosso ◽  
Spiroplasma Kunkelii ◽  
Mato Grosso Do Sul ◽  
New Distribution

Abstract A new distribution map is provided for Spiroplasma kunkelii Whitcomb, Chen et al. Bacteria. Hosts: maize (Zea mays), sweetcorn (Zea mays subsp. mays), teosinte (Zea mexicana) and perennial teosinte (Zea perennis). Information is given on the geographical distribution in North America (Mexico, USA, California, Florida, Louisiana, Michigan, Mississippi, Ohio, Texas), Central America and Caribbean (Belize, El Salvador, Guatemala, Honduras, Jamaica, Nicaragua, Panama), South America (Argentina, Bolivia, Brazil, Mato Grosso do Sul, Minas Gerais, Colombia, Paraguay, Peru, Venezuela).

Ustilago hypodytes. [Descriptions of Fungi and Bacteria].

1984 ◽  
Author(s):  
J. E. M. Mordue
Keyword(s):  
New Zealand ◽  
North America ◽  
South America ◽  
Root System ◽  
Geographical Distribution ◽  
Host Plants ◽  
Meristematic Tissue ◽  
Wide Range ◽  
Vegetative Multiplication ◽  
Established Infection

Abstract A description is provided for Ustilago hypodytes. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: A wide range of grasses, including species of Agropyron (many), Ammophila, Brachypodium, Bromus, Calamagrostis, Diplachne, Distichlis, Elymus (many), Festuca, Glyceria, Hilaria, Hordeum, Haynaldia, Lygeum, Melica, Orysopsis, Panicum, Phalaris, Phleum, Poa (many), Puccinellia, Secale, Sitanion, Sporobolus, Stipa (many), and Trisetum. DISEASE: Stem smut of grasses. GEOGRAPHICAL DISTRIBUTION: Chiefly a temperate species found in Europe (including Denmark, Finland, France, Germany, Hungary, Italy, Romania, Sweden, Switzerland, UK, USSR, Yugoslavia) and North America (Canada, USA) and extending to central and South America (Argentina, Peru, Uruguay), N. Africa (Libya, Morocco, Tunisia), Japan, Australia and New Zealand. TRANSMISSION: Not fully understood, though inoculation experiments have demonstrated that infection occurs in mature vegetative plants (possibly through meristematic tissue), not seeds or flowers (22, 240; 24, 511). Once established, infection is systemic, probably overwintering in the root system and spreading by vegetative multiplication of host plants as well as from plant to plant (24, 511; 19, 720).

scholarly journals The integration of plant behaviour. - II. The influence of the shoot on the growth of roots in seedlings

1930 ◽  
Vol 106 (743) ◽  
pp. 182-188 ◽  
Keyword(s):  
Zea Mays ◽  
Root System ◽  
Vicia Faba ◽  
Plant Behaviour ◽  
Species Removal

Several investigators have already studied the manner in which the growth of roots is affected when the shoots are removed. Kny concluded (1, p. 279) that in young seedlings of Vicia Faba and Zea Mays the growth in length of the main roots and the increase in weight of the whole root-system were altered very little, if at all, by the removal of the shoot. But Townsend (6, p. 515) found that in seedlings of the same species removal of the shoot distinctly accelerated the growth in length of the root, though not until after a preliminary period of 1 or 2 days, during which the growth of the root was unaltered or slightly retarded. His results certainly appear more convincing than those of Kny.

Maize rayado fino marafivirus. [Distribution map].

1997 ◽  
Author(s):  
Keyword(s):  
Zea Mays ◽  
Costa Rica ◽  
North America ◽  
South America ◽  
El Salvador ◽  
Central America ◽  
Geographical Distribution ◽  
Distribution Map ◽  
New Distribution

Abstract A new distribution map is provided for Maize rayado fino marafivirus Viruses: Marafivirus Hosts: Maize (Zea mays). Information is given on the geographical distribution in NORTH AMERICA, Mexico, USA, Florida, Texas, CENTRAL AMERICA & CARIBBEAN, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama, SOUTH AMERICA, Argentina, Brazil, Parana, Colombia, Peru, Uruguay, Venezuela.

Corynebacterium michiganense pv. nebraskense. [Distribution map].

1982 ◽  
Author(s):  
Keyword(s):  
Zea Mays ◽  
North America ◽  
Geographical Distribution ◽  
Distribution Map ◽  
New Distribution

Abstract A new distribution map is provided for Corynebacterium michiganense pv. nebraskense (Schuster et al.) Dye & Kemp. Hosts: Maize (Zea mays). Information is given on the geographical distribution in NORTH AMERICA, USA.

Phyllachora maydis. [Distribution map].

2021 ◽  
Author(s):  
Keyword(s):  
Zea Mays ◽  
Puerto Rico ◽  
North America ◽  
South America ◽  
Dominican Republic ◽  
Trinidad And Tobago ◽  
Virgin Islands ◽  
Distribution Map ◽  
Us Virgin Islands ◽  
New Distribution

Abstract A new distribution map is provided for Phyllachora maydis Maublanc. Sordariomycetes: Phyllachorales: Phyllachoraceae. Host: maize (Zea mays). Information is given on the geographical distribution in North America (Canada, Ontario, Costa Rica, Dominican Republic, El Salvador, Guatemala, Haiti, Honduras, Mexico, Nicaragua, Panama, Puerto Rico, Trinidad and Tobago, US Virgin Islands, USA, Florida, Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, Wisconsin), and South America (Bolivia, Colombia, Ecuador, Peru, Venezuela).

Kabatiella zeae. [Distribution map].

1993 ◽  
Author(s):  
Keyword(s):  
New York ◽  
Zea Mays ◽  
New Zealand ◽  
North America ◽  
South America ◽  
South Dakota ◽  
Geographical Distribution ◽  
Distribution Map ◽  
New Distribution

Abstract A new distribution map is provided for Kabatiella zeae Narita & Y. Hirats. Hosts: Maize (Zea mays). Information is given on the geographical distribution in Asia, China, Jilin, Yunnan, Japan, Hokkaido, Australasia, New Zealand, Europe, Austria, France, Germany, Yugoslavia, Croatia, North America, Canada, Ontario, Quebec, USA, Iowa, Illinois, Indiana, Michigan, Minnesota, New York, South Dakota, Wisconsin, South America, Argentina, Brazil.

Does the lack of root hairs alter root system architecture of Zea mays?

2021 ◽  
Author(s):  
Steffen Schlüter ◽  
Eva Lippold ◽  
Maxime Phalempin ◽  
Doris Vetterlein
Keyword(s):  
Zea Mays ◽  
Root System ◽  
Root Hair ◽  
System Architecture ◽  
Volume Fraction ◽  
Root Hairs ◽  
Root System Architecture ◽  
Root Diameter ◽  
Wild Type ◽  
Defective Mutant

<p>Root hairs are one root trait among many which enables plants to adapt to environmental conditions. How different traits are coordinated and whether some are mutually exclusive is currently poorly understood. Comparing a root hair defective mutant with its corresponding wild-type we explored if and how the mutant exhibited root growth adaption strategies and as to how far this depended on the substrate.</p><p>Zea mays root hair defective mutant (rth3) and the corresponding wild-type siblings were grown on two substrates with contrasting texture and hence nutrient mobility. Root system architecture was investigated over time using repeated X-ray computed tomography.</p><p>There was no plastic adaption of root system architecture to the lack of root hairs, which resulted in lower uptake in particular in the substrate with low P mobility. The function of the root hairs for anchoring did not result in different depth profiles of the root length density between genotypes. Both maize genotypes showed a marked response to substrate. This was well reflected in the spatiotemporal development of rhizosphere volume fraction but especially in the strong response of root diameter to substrate, irrespective of genotype.</p><p>The most salient root plasticity trait was root diameter in response to substrate, whereas coping mechanisms for missing root hairs were less evident. Further experiments are required to elucidate whether observed differences can be explained by mechanical properties beyond mechanical impedance, root or microbiome ethylene production or differences in diffusion processes within the root or the rhizosphere.</p>

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