P.J. Gerard

1.5k total citations
99 papers, 887 citations indexed

About

P.J. Gerard is a scholar working on Insect Science, Plant Science and Ecology, Evolution, Behavior and Systematics. According to data from OpenAlex, P.J. Gerard has authored 99 papers receiving a total of 887 indexed citations (citations by other indexed papers that have themselves been cited), including 57 papers in Insect Science, 49 papers in Plant Science and 42 papers in Ecology, Evolution, Behavior and Systematics. Recurrent topics in P.J. Gerard's work include Insect-Plant Interactions and Control (29 papers), Biological Control of Invasive Species (23 papers) and Agronomic Practices and Intercropping Systems (21 papers). P.J. Gerard is often cited by papers focused on Insect-Plant Interactions and Control (29 papers), Biological Control of Invasive Species (23 papers) and Agronomic Practices and Intercropping Systems (21 papers). P.J. Gerard collaborates with scholars based in New Zealand, United Kingdom and Spain. P.J. Gerard's co-authors include S. Hardwick, Alison J. Popay, Deborah J. Wilson, Nigel B. Perry, M.R. McNeill, Lysa M. Foster, N.L. Bell, C.B. Phillips, J. R. Crush and S.L. Goldson and has published in prestigious journals such as Journal of Agricultural and Food Chemistry, The Journal of Organic Chemistry and Tetrahedron.

In The Last Decade

P.J. Gerard

96 papers receiving 839 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
P.J. Gerard New Zealand 18 479 371 343 124 113 99 887
R.J. Townsend New Zealand 14 276 0.6× 222 0.6× 198 0.6× 62 0.5× 130 1.2× 62 625
S. L. Clement United States 15 260 0.5× 366 1.0× 401 1.2× 67 0.5× 237 2.1× 51 851
R.A. Prestidge New Zealand 18 348 0.7× 340 0.9× 1.0k 3.0× 127 1.0× 362 3.2× 65 1.3k
L. Torres Portugal 17 536 1.1× 338 0.9× 278 0.8× 29 0.2× 110 1.0× 67 759
Eric Wyss Switzerland 18 872 1.8× 622 1.7× 505 1.5× 44 0.4× 137 1.2× 48 1.2k
John N. Matthiessen Australia 16 218 0.5× 672 1.8× 124 0.4× 117 0.9× 209 1.8× 44 911
Rosemary Collier United Kingdom 18 969 2.0× 763 2.1× 428 1.2× 131 1.1× 154 1.4× 78 1.4k
Iain D. Paterson South Africa 18 688 1.4× 382 1.0× 258 0.8× 28 0.2× 48 0.4× 67 923
Charles Martins de Oliveira Brazil 18 736 1.5× 707 1.9× 293 0.9× 30 0.2× 310 2.7× 86 1.3k
Francisco Rubén Badenes‐Pérez Spain 20 1.2k 2.5× 1.1k 3.1× 444 1.3× 90 0.7× 697 6.2× 44 1.7k

Countries citing papers authored by P.J. Gerard

Since Specialization
Citations

This map shows the geographic impact of P.J. Gerard's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by P.J. Gerard with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites P.J. Gerard more than expected).

Fields of papers citing papers by P.J. Gerard

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by P.J. Gerard. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by P.J. Gerard. The network helps show where P.J. Gerard may publish in the future.

Co-authorship network of co-authors of P.J. Gerard

This figure shows the co-authorship network connecting the top 25 collaborators of P.J. Gerard. A scholar is included among the top collaborators of P.J. Gerard based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with P.J. Gerard. P.J. Gerard is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
James, T.K., et al.. (2023). Winter cover crops to reduce herbicide inputs into spring‐planted maize pastoral systems in New Zealand. New Zealand Journal of Agricultural Research. 67(1). 66–80. 1 indexed citations
2.
Gerard, P.J., et al.. (2020). Investigation into the contrasting production of eight perennial clover cultivars in the first two years at field sites in in Waikato and Canterbury. New Zealand Journal of Agricultural Research. 65(4-5). 271–289. 7 indexed citations
3.
Gerard, P.J., et al.. (2018). Does pasture plant diversity influence abundance and diversity of lacewings and Hymenopteran parasitoids?. Proceedings of the New Zealand Weed Control Conference. 71. 207–213. 1 indexed citations
4.
Gerard, P.J., et al.. (2017). Oviposition and development of two plantain pests, Scopula rubraria and Epyaxa rosearia (Lepidoptera: geometridae). New Zealand Journal of Agricultural Research. 61(4). 414–424. 6 indexed citations
5.
Gerard, P.J., et al.. (2017). Effect of narrow‐leaved plantain cultivar on development of two geometrid pests, Scopula rubraria and Epyaxa rosearia. New Zealand Journal of Agricultural Research. 61(4). 403–413. 2 indexed citations
6.
Gerard, P.J., et al.. (2017). Comparison of New Zealand perennial clovers for resilience against common pasture pests. Proceedings of the New Zealand Weed Control Conference. 70. 241–249. 7 indexed citations
7.
8.
Cock, Matthew J.W., Jacobus C. Biesmeijer, R. J. C. Cannon, et al.. (2013). The implications of climate change for positive contributions of invertebrates to world agriculture.. CABI Reviews. 1–48. 15 indexed citations
9.
Cock, Matthew J.W., Jacobus C. Biesmeijer, R. J. C. Cannon, et al.. (2012). The positive contribution of invertebrates to sustainable agriculture and food security.. CABI Reviews. 1–27. 30 indexed citations
10.
Gerard, P.J., et al.. (2010). Effect of clover root weevil larval feeding on growth of clover progenies from parents selected for tolerance in field trials. New Zealand Journal of Agricultural Research. 53(3). 227–234. 4 indexed citations
11.
Gerard, P.J., et al.. (2009). The bionomics of an invasive speciesSitona lepidusduring its establishment in New Zealand. Bulletin of Entomological Research. 100(3). 339–346. 16 indexed citations
12.
Gerard, P.J., et al.. (2007). Impact of clover root weevil Sitona lepidus (Coleoptera: Curculionidae) larvae on herbage yield and species composition in a ryegrass‐white clover sward. New Zealand Journal of Agricultural Research. 50(3). 381–392. 28 indexed citations
13.
Clark, Richard J., et al.. (2004). Spider biodiversity and density following cultivation in pastures in the Waikato, New Zealand. New Zealand Journal of Agricultural Research. 47(2). 247–259. 9 indexed citations
14.
Goldson, S.L., M.R. McNeill, P.J. Gerard, et al.. (2004). British‐based search for natural enemies of the clover root weevil, Sitona lepidus in Europe. New Zealand Journal of Zoology. 31(3). 233–240. 13 indexed citations
15.
Gerard, P.J.. (2002). The digestive system of the keratin‐feeding larvae of Hofmannophila pseudospretella (Lepidoptera: Oecophoridae). New Zealand Journal of Zoology. 29(1). 15–22. 8 indexed citations
16.
Ainge, Gary D., et al.. (2002). Insecticidal Activity of Huperzine A from the New Zealand Clubmoss, Lycopodium varium. Journal of Agricultural and Food Chemistry. 50(3). 491–494. 21 indexed citations
17.
Gerard, P.J., et al.. (1999). Effect of wool staple characteristics on feeding and development of webbing clothes moth larvae.. Wool technology and sheep breeding. 47(1). 1 indexed citations
18.
Gerard, P.J., et al.. (1997). Activity of extracts and compounds from New Zealand gymnosperms against larvae of Lucilia cuprina (Diptera: Calliphoridae). New Zealand Journal of Agricultural Research. 40(2). 261–267. 11 indexed citations
19.
Gerard, P.J. & G. P. Burton. (1983). Growth and development of Australian soldier fly, Inopus rubriceps (Diptera: Stratiomyidae), in New Zealand. New Zealand Journal of Zoology. 10(1). 75–81. 5 indexed citations
20.
Gerard, P.J., et al.. (1979). Effect of stocking rate on emergence, dispersal, and behaviour of soldier fly adults in pasture. New Zealand Journal of Agricultural Research. 22(3). 507–510. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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