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 Aug 2002-Journal of Veterinary Medicine Series B-infectious Diseases and Veterinary Public Health
TL;DR: Since all the animals were of the same breed, age group and were managed similarly the selection of animals with low infestation level can be a component of tick control strategy.
Abstract: In this study the dominant tick species identified were Amblyomma cohaerens 52.2%, Rhipicephaluspravus 19.3% and A. variegatum 14.6%. A. cohaerens occurred throughout the sampling period and showed a peak during March. Their number declined significantly (P < 0.01) from August to December. R. pravus occurred from July to December only and peaking in September (P < 0.01). A. variegatum occurred in low numbers throughout the study period with a marked seasonal variation (P < 0.01) and abundant numbers of ticks were observed from May to July. The other tick species identified were Boophilus decoloratus, R. bergeoni and R. evertsi evertsi. Individual variation in tick infestation level was observed among the animals (P < 0.05). Since all the animals were of the same breed, age group and were managed similarly the selection of animals with low infestation level can be a component of tick control strategy.
47 citations
TL;DR: The results from the discriminant analysis indicate that the most effective induction of volatiles occurred when fruits were infested with first instar larvae, and for most compounds it also exceeded the emission from artificially damaged fruits.
47 citations
Journal Article•
TL;DR: Factors associated with the onset of pediculosis included overcrowding, long hair, family size, age, living in a sordid environment, and personal hygiene, according to a survey of primary school children in Ilorin, Nigeria.
Abstract: A survey of 6882 primary school children living in Ilorin, Nigeria revealed that 3.7% of the children were infested with Pediculus humanus capitis. Infestation rate among the children in the Islamic community was 4.1%, whereas in the Christian area, the infestation rate was 3%. Girls had a higher infestation rate (5.6%) than boys (2.1%). The highest infestation rate (28.4%) was observed among girls of low socioeconomic class, followed by their male counterparts (11.2%). Factors associated with the onset of pediculosis included overcrowding, long hair, family size, age, living in a sordid environment, and personal hygiene. Strategies for the effective control of pediculosis are discussed.
47 citations
TL;DR: It was determined that the regime of nutrient supply to wheat seedlings had no effect on the magnitude of the aphid-induced Hx (N-based secondary metabolites), and the age of the infested tissue did not affect induction.
Abstract: Hydroxamic acids (Hx) are natural products of Gramineae that are associated with cereal resistance to pests. We aimed at characterizing the induction of Hx accumulation in seedlings of wheat,Triticum aestivum, by short-term infestation of the cereal aphid,Rhopalosiphum padi. A load of 25 aphids increased significantly the Hx levels in the infested primary leaf in comparison with control levels. Lower loads did not increase Hx concentration. Aphid infestation lasting 16 hr did not elicit induction of Hx, even after a time-lag of 32 hr to allow the expression of any induced response. Forty-eight hours was the minimum duration of aphid infestation required to trigger Hx induction. The age of the infested tissue (the primary leaf) did not affect induction. Similar increases of Hx were found in unfolding, expanding, and totally expanded primary leaves. It was determined that the regime of nutrient supply (N-intensive nutritive solutions at low and high concentration) to wheat seedlings had no effect on the magnitude of the aphid-induced Hx (N-based secondary metabolites). Results obtained are discussed in the framework of general theories of plant defense allocation.
47 citations
TL;DR: The effect of various infestation levels expressed as mite-days, of Tetranychus urticae Koch on the chlorophyll content, transpiration, and photosynthesis of strawberry leaflets was studied and the effect of mite feeding on stomatal opening and functional integrity of leaf tissue is discussed.
Abstract: The effect of various infestation levels expressed as mite-days, of Tetranychus urticae Koch on the chlorophyll content, transpiration, and photosynthesis of strawberry leaflets was studied. No reduction in chlorophyll content was observed at any infestation level, but transpiration and photosynthesis were reduced at low levels of 2.5 and 5.0 mite-days/cm2. Transpiration decreased rapidly by 42% at densities up to 15 mite-days/cm2, but at higher densities reduction was gradual and resulted in only an 11% reduction for an additional 35 mite-days/cm2. Photosynthesis was similarly affected at the low feeding levels (2.5–15 mite-days/cm2) but continued to decrease linearly with increasing infestation levels resulting in a 60% reduction at 50 mite-days/cm2. The effect of mite feeding on stomatal opening and functional integrity of leaf tissue is discussed.
47 citations