Patterns of host use by the shoot-borer Hypsipyla robusta (Pyralidae: Lepidoptera) comparing five Meliaceae tree species in Asia and Australia

2005 ◽  
Vol 205 (1-3) ◽  
pp. 351-357 ◽  
Author(s):  
Saul A. Cunningham ◽  
Robert B. Floyd ◽  
M.W Griffiths ◽  
F. Ross Wylie
Keyword(s):  
Tree Species ◽  
Host Use ◽  
Shoot Borer ◽  
Hypsipyla Robusta

scholarly journals Host-generalist fungal pathogens of seedlings may maintain forest diversity via host-specific impacts and differential susceptibility among tree species

2020 ◽  
Author(s):  
Erin R. Spear ◽  
Kirk Broders
Keyword(s):  
Tree Species ◽  
Fungal Pathogens ◽  
Phylogenetic Signal ◽  
Differential Susceptibility ◽  
Host Use ◽  
List Type ◽  
Disease Symptoms ◽  
Forest Diversity ◽  
Relative Rarity ◽  
Disease Pressure

SummaryHost-specialized pathogens are credited with the maintenance of tropical forest diversity under the Janzen-Connell hypothesis (JCH). Yet, in diverse forests, selection should favor pathogens with broad host ranges given their passive dispersal and the relative rarity of tree species.We surveyed the host associations of potential pathogens isolated from symptomatic seedlings in the forests in Panama; and used inoculations to assess the pathogenicity and host ranges of 27 fungal isolates, and (ii) differences among tree species in susceptibility.Thirty-one of the 33 non-singleton OTUs isolated from seedlings are multi-host. All 31 multi-host OTUs exhibit low to moderate specialization and phylogenetically dispersed host use, with no phylogenetic signal. The pathogenicity of 10 isolates was experimentally confirmed; nine caused disease in seedlings in multiple families. However, the outcome of infection differs among tree species susceptible to a given multi-host pathogen. Furthermore, some tree species were seemingly resistant to all fungi tested, while others were susceptible to multiple fungi. Tree species adapted to environments with lower disease pressure were most likely to exhibit disease symptoms.Our results suggest that generalist pathogens contribute to the maintenance of local forest diversity via host-specific impacts rather than the host specificity originally envisioned under JCH.

scholarly journals Effects of artificial shade on attack by the mahogany shoot borer, Hypsipyla robusta (Moore)

2002 ◽  
Vol 4 (4) ◽  
pp. 283-292 ◽  
Author(s):  
R. M. Mahroof ◽  
C. Hauxwell ◽  
J. P. Edirisinghe ◽  
A. D. Watt ◽  
A. C. Newton
Keyword(s):  
Shoot Borer ◽  
Hypsipyla Robusta

Provenance variation in Khaya species for growth and resistance to shoot borer Hypsipyla robusta

2007 ◽  
Vol 242 (2-3) ◽  
pp. 438-443 ◽  
Author(s):  
D.A. Ofori ◽  
E. Opuni-Frimpong ◽  
J.R. Cobbinah
Keyword(s):  
Provenance Variation ◽  
Shoot Borer ◽  
Hypsipyla Robusta

scholarly journals Non-overlap of hosts used by three congeneric and sympatric loranthaceous mistletoe species in an Amazonian savanna: host generalization to extreme specialization

2011 ◽  
Vol 25 (2) ◽  
pp. 337-345 ◽  
Author(s):  
Rodrigo Ferreira Fadini
Keyword(s):  
Plant Species ◽  
Relative Abundance ◽  
Tree Species ◽  
Host Use ◽  
Deposition Patterns ◽  
Host Tree Species ◽  
Seed Deposition ◽  
Individual Trees ◽  
Vatairea Macrocarpa ◽  
Extreme Specialization

Two main hypotheses predominate in the literature on mistletoe-host specificity: (1) mistletoes are only likely to specialize on plant species on which they are frequently deposited; and (2) compatibility between mistletoes and plant species is a prerequisite for mistletoe-host parasitism. I explored these hypotheses by studying the seed deposition patterns and mistletoe-host compatibility in populations of three congeneric and sympatric mistletoe species of the genus Psittacanthus (P. biternatus, P. eucalyptifolius and P. plagiophyllus - Loranthaceae). I recorded the presence or absence of these mistletoe species in 15 tree species in a savanna patch in Amazonia. Among the five tree species that I found to be potential hosts (at least one tree individual infected), I also recorded if they had at least one mistletoe seed of any species attached to their branches. Finally, I planted seeds of all mistletoe species on the same individual trees in various hosts and non-host species and recorded seed survivorship and seedling establishment within 7 (P. plagiophyllus) to 12 months (P. biternatus and P. eucalyptifolius) after planting. There was no overlap among trees used as hosts by the three Psittacanthus species. Th e most specialized mistletoe species occurred in different host tree species with low relative abundance at the study site (Psittacanthus eucalyptifolius on Vatairea macrocarpa (Benth.) Ducke, and P. plagiophyllus on Anacardium occidentale L.). Mistletoe-host compatibility, and not seed deposition patterns, was the factor most likely to explain patterns of host use by Psittacanthus species at this study site.

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