Topic
Infestation
About: Infestation is a research topic. Over the lifetime, 8308 publications have been published within this topic receiving 82305 citations.
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01 Jan 2008
TL;DR: In this article, attributes associated with the probability of infestation by pinon ips (Ips confusus), in pinon pine (Pinus edulis), in an outbreak in the Coconino National Forest, Arizona.
Abstract: (Please note, this is an abstract only) We examined attributes associated with the probability of infestation by pinon ips (Ips confusus), in pinon pine (Pinus edulis), in an outbreak in the Coconino National Forest, Arizona. We used data collected from 87 plots, 59 infested and 28 uninfested, and a logistic regression approach to estimate the probability of infestation based on plot- and tree-level attributes. Pinon pine stand density index was a good predictor of the likelihood of infestation by pinon ips at the plot level and a cross-validation analysis indicated that the model correctly classified 82% of the cases. Diameter at root collar and pinon dwarf mistletoe infestation level were good predictors of individual tree infestation and a cross-validation analysis indicated that the model correctly classified 72% of the cases. Results suggest that the occurrence of pinon ips infestations may be related to stress factors associated with increased stocking and pinon dwarf mistletoe infestations.
51 citations
TL;DR: Although each country studied or a region within a country has a particular set of weeds causing severe infestation, in general the species of greatest importance common to the whole of the area studied include Cynodon dactylon, Cyperus rotundus, Phragmites australis, and Setaria verticillata.
Abstract: A list of weeds of agricultural areas in the central, southern and eastern Arabian Peninsula is presented along with the maximum intensities of weed infestation resulting from these plants. Although each country studied or a region within a country has a particular set of weeds causing severe infestation, in general the species of greatest importance common to the whole of the area studied include Cynodon dactylon (L.) Pers., Cyperus rotundus L., Phragmites australis (Cav.) Trin., Convolvulus arvensis L., Portulaca oleracea L., Amaranthus graecizans L., Dactyloctenium aegyptium (L.) P. Beauv. Echinochloa colonum (L.) Link. and Setaria verticillata (L.) P. Beauv.
51 citations
TL;DR: Levels of soluble protein in plants influenced their susceptibility to thrips more than levels of carbohydrates, and leaves from species of plants that supported populations of thrips had greater levels of protein than leaves from nonhost species.
Abstract: Levels of soluble protein and carbohydrate (raffinose, sucrose, glucose, and fructose) in leaves from a selection of plant species were measured to determine if a relationship existed between these nutrients and infestation by Frankliniella occidentalis and Heliothrips haemorrhoidalis. Most species of host plant examined contained a higher proportion of protein than carbohydrates, and overall, leaves from species of plants that supported populations of thrips had greater levels of protein than leaves from nonhost species. New leaves and flowers that supported F. occidentalis contained high levels of carbohydrate and protein. The quantity of protein in leaves at the top of the tree, Peumus boldus, was greater than in leaves from lower levels, and the amount of feeding damage accrued by H. haemorrhoidalis was greater on the upper foliage than lower foliage. Oviposition by H. haenmorrhoidalis was positively correlated to levels of protein in host plants but not to levels of carbohydrates. Overall, levels of soluble protein in plants influenced their susceptibility to thrips more than levels of carbohydrates.
51 citations
TL;DR: Weight losses of wheat grains caused by psocid infestation (Liposcelis bostrychophila: Liposcelididae: Psocoptera): weight losses were positively correlated with progeny production.
Abstract: KUČEROVÁ Z. (2002): Weight losses of wheat grains caused by psocid infestation (Liposcelis bostrychophila: Liposcelididae: Psocoptera). Plant Protect. Sci., 38: 103–107. Psocids are commonly found to be a persistent pest in structures of grain stores. Grain residues are potential pest reservoirs that serve as sources of grain re-infestation. Weight losses caused by psocids on broken wheat kernels were measured. Average weight loss of grain samples was 9.7% after 3 months of Liposcelis bostrychophila infestation. The weight losses were positively correlated with progeny production.
51 citations
Journal Article•
TL;DR: It was found that infestation could be explained partly by the dispersive flight of the bugs according to the distances between houses, and part by the predisposition of houses to infestation by virtue of their construction, since houses with cracked mud walls were particularly susceptible to infested houses.
Abstract: Dispersive flight by Triatoma infestans was modelled by assuming either unidirectional flight in a straight line, or that flight followed a pattern of 'random walk' analogous to two-dimensional Brownian motion. Parameter estimates for the models were derived from previous fieldwork in Argentina and Brazil. Calculated probabilities of houses becoming infested over a 1 year period were compared with actual changes of house infestation in a small farming community in central Brazil. It was found that infestation could be explained partly by the dispersive flight of the bugs according to the distances between houses, and partly by the predisposition of houses to infestation by virtue of their construction, since houses with cracked mud walls were particularly susceptible to infestation. Infested houses lying more than 200 m from uninfested houses appeared to make an almost negligible contribution to infestation of the uninfested houses. This suggests that buffer zones of this size around treated areas could help to minimize the risk of reinfestation after treatment.
51 citations