Egg parasitoids of <i>Leptoglossus stigma</i> (Hemiptera: Coreidae) in Brazilian guava crops, with description of a new <i>Neorileya species</i> (Hymenoptera: Eurytomidae)

Schoeninger, Karine; Wengrat, Ana P.G. da Silva; Souza-Filho, Miguel F. de; Perioto, Nelson W.; Schwertner, Cristiano F.; Bueno, Roselaine N. da Silva; Gates, Michael; Costa, Valmir A.

doi:10.1590/S1984-4689.v43.e25056

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Research Article • Zoologia (Curitiba) 43 • 2026 • https://doi.org/10.1590/S1984-4689.v43.e25056 linkcopy

Egg parasitoids of Leptoglossus stigma (Hemiptera: Coreidae) in Brazilian guava crops, with description of a new Neorileya species (Hymenoptera: Eurytomidae)

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In guava orchards, Psidium guajava Linnaeus, 1753 (Myrtaceae), significant damage is caused by bugs of the genus Leptoglossus Guérin-Méneville, 1831 (Hemiptera: Coreidae). Identifying the diversity of parasitoid wasps associated with leaf-footed bug eggs, particularly Leptoglossus stigma (Herbst, 1784), is essential for recognizing natural enemies and developing sustainable pest control strategies. Between March 2003 and April 2004, 1,132 eggs of L. stigma were collected in a guava orchard in São Paulo, Brazil. Of these, 657 were parasitized by three species: a new species of Neorileya Ashmead, 1904 (Eurytomidae), Hadronotus vitripennis (Masner, 1983), and Hadronotus sp., (near H. pennsylvanicus, Scelionidae). We describe Neorileya kavatii Schoeninger & Costa, sp. nov. (Hymenoptera: Eurytomidae), which caused 70% mortality in field-collected egg masses. Morphological data, DNA-barcode sequences, and images of diagnostic characters are provided to characterize the new species. Finally, we discuss the potential of N. kavatii sp. nov. as a biological control agent.

KEYWORDS:
DNA-barcoding; leaf-footed bug; natural enemies; Rileyinae; taxonomy

Number of			Parasitoidism (%)	Number of eggs parasitized by			Total number of parasitoid adults
Egg mass	Leptoglossus spp. eggs in mass	Parasitized eggs	Parasitoidism (%)	N. kavatii	H. vitripennis	Hadronotus sp.	Total number of parasitoid adults
1	14	6	42.9	6	0	0	6
2	27	27	100.0	9	18	0	27
3	40	18	45.0	16	2	0	18
4	13	10	76.9	9	1	0	10
5	19	11	57.9	6	5	0	11
6	7	7	100.0	1	6	0	7
7	46	24	52.2	24	0	0	24
8	7	0	0.0	0	0	0	0
9	32	1	3.1	1	0	0	1
10	20	12	60.0	8	4	0	12
11	30	0	0.0	0	0	0	0
12	23	13	56.5	13	0	0	13
13	5	5	100.0	0	5	0	5
14	11	10	90.9	9	0	1	10
15	16	11	68.8	10	1	0	11
16	25	23	92.0	18	1	4	23
17	5	0	0.0	0	0	0	0
18	10	10	100.0	3	7	0	10
19	10	5	50.0	0	5	0	5
20	31	4	12.9	4	0	0	4
21	16	13	81.3	12	1	0	13
22	20	9	45.0	9	0	0	9
23	46	39	84.8	14	25	0	39
24	28	28	100.0	11	17	0	28
25	33	24	72.7	8	16	0	24
26	24	1	4.2	1	0	0	1
27	20	11	55.0	0	11	0	11
28	21	10	47.6	9	1	0	10
29	17	15	88.2	15	0	0	15
30	25	14	56.0	11	3	0	14
31	10	8	80.0	8	0	0	8
32	27	27	100.0	14	0	13	27
33	10	9	90.0	9	0	0	9
34	22	0	0.0	0	0	0	0
35	10	7	70.0	7	0	0	7
36	28	20	71.4	20	0	0	20
37	42	36	85.7	34	0	2	36
38	54	0	0.0	0	0	0	0
39	23	20	87.0	2	15	3	20
40	20	0	0.0	0	0	0	0
41	15	0	0.0	0	0	0	0
42	42	35	83.3	32	0	3	35
43	21	14	66.7	14	0	0	14
44	14	13	92.9	11	2	0	13
45	23	15	65.2	15	0	0	15
46	24	13	54.2	13	0	0	13
47	29	17	58.6	17	0	0	17
48	23	9	39.1	8	1	0	9
49	15	15	100.0	2	0	13	15
50	39	38	97.4	38	0	0	38
Total	1132	657		470	147	39	657

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