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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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Journal ArticleDOI
TL;DR: This study of Cuterebra parasitic on the deermouse refutes some previous hypotheses of why infested Peromyscus appear to survive longer than healthy mice.
Abstract: This study of Cuterebra parasitic on the deermouse (Peromyscus maniculatus) refutes some previous hypotheses of why infested Peromyscus appear to survive longer than healthy mice. This phenomenon is solely the result of mice that remain on the plot longer having a longer exposure to the infestation and hence a greater incidence of attack. This contention is supported by the incidence of infestation per month being the same in transients and residents even though residents had a greater overall degree of infestation. The similar incidence of infestation per month also indicates that the fly lays its eggs in such a way that neither transients nor residents are favored to contact the infestation, a result that is compatible with the observations of several workers on botfly oviposition habits.

36 citations

Journal ArticleDOI
TL;DR: Surveys of petal infestation and stem infection conducted in 1998, 1999 and 2000 indicated that Sclerotinia sclerotiorum poses a threat to the Australian canola industry.
Abstract: Surveys of petal infestation and stem infection conducted in 1998, 1999 and 2000 indicated that Sclerotinia sclerotiorum poses a threat to the Australian canola industry. Inoculum was present throughout all canola-growing regions of New South Wales and the stem disease was widespread throughout southern New South Wales. Percentage petal infestation increased over the 3 years surveyed with values ranging from 0 to 99.4%. The highest petal infestation values were observed in 2000 (maximum of 99.4%, mean of 82.2%), with lower mean values in 1998 (38.4%) and 1999 (49.6%). Stem infection ranged from 0 to 37.5% and most fields had less than 10% stem infection. Stem rot incidence before harvest did not relate to percentage petal infestation determined during flowering. This indicated that factors other than percentage petal infestation were important in influencing stem rot incidence. While there was no relationship between percentage petal infestation and stem rot incidence, stem infection never occurred without prior petal infestation.

36 citations

Journal ArticleDOI
TL;DR: A close correlation was found between infestation of R. padi in different wheat genotypes and losses of grain yield and loss of thousand-kernel mass, and there were tolerance differences among genotypes even within the same level of infestation.
Abstract: In Hungary the bird cherry-oat aphid (Rhopalosiphum padi L.) is the most frequent aphid species in winter wheat (Triticum aestivum L.). Estimations of infestation by R. padi as well as measurements of grain yield and thousand-kernel mass were carried out in 26 winter wheat genotypes in conditions of naturally infested and not infested (protected) control plots. The experiment was performed in isolated conditions in two field cages covered by nets. The aphids overwintered on wheat and got into cage, extremely quickly multiplied, therefore there was no need to apply any artificial aphid infestation. Highly significant differences were demonstrated among genotypes in infestation severity of R. padi as well as in losses of grain yield and thousand-kernel mass. The most resistant variety ‘GK Zombor’ had 25% infestation, and the most susceptible one ‘GK Lili’ had 79.2%. The reduction of grain yield of the most tolerant genotypes (‘GK Korany’, ‘Downy’, ‘Mv 4’, ‘Jubilejnaja 50’, ‘Mv 8’, ‘GK Kincso’ and ‘GK Zombor’) was 26–33%, and that of thousand-kernel mass was 23–30%. The most sensitive genotypes (‘GK Lili’, ‘GK Orzse’, ‘GK Koppany’ and ‘Mv 13’) suffered 58–63% losses in yield, and 40–50% in thousand-kernel mass. A close correlation was found between infestation of R. padi in different wheat genotypes and losses of grain yield (r=0.7572, P<0.001). Also there were tolerance differences among genotypes even within the same level of infestation. The reductions of thousand-kernel mass correlated very closely with the reductions of grain yield (r=0.9212, P<0.001), that makes screening possible by reductions of thousand-kernel mass. These results have found application in breeding. The leaf pubescence of the varieties studied did not generally influence the infestation by R. padi.

36 citations

Journal ArticleDOI
TL;DR: The mother tree had the greatest effect on fungal and insect infestation, indicating the importance of the genetic disposition and/or the phytosanitary situation of each tree.
Abstract: Chestnuts were collected either every 7 days from suspended nets used to intercept the fruits, every 2 days from the ground or every 7 days from the ground. Nuts were visually inspected after collection for the presence of exit holes of the chestnut weevil (Curculio elephas) and the chestnut moth (Cydia splendana), and 20 nuts per sampling and tree were bisected to assess fungal colonization. Apparently healthy nuts were incubated at 24� C and 70–80% relative humidity for 21 days. All nuts were bisected after incubation and examined for the presence of insects and moulds. The harvest method did not have a statistically significant effect on either moulding or insect infestation except on Amphiporthe castanea. This vertically transmitted fungal endophyte was less frequently isolated from fruits collected after 7 days from the ground. The black rot fungus Ciboria batschiana did not occur in chestnuts intercepted in nets, but the difference to chestnuts collected from the ground was statistically not significant. The frequency of nuts colonized by C. batschiana was low in general probably due to the hot and dry summer in 2003. Big, marketable fruits appeared to be less frequently colonized by insects and moulds right after collection. This difference disappeared after incubation except for the chestnut moth. The mother tree had the greatest effect on fungal and insect infestation, indicating the importance of the genetic disposition and/or the phytosanitary situation of each tree. The chestnut weevil preferred chestnuts of the

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023602
20221,428
2021276
2020344
2019294