Survival and injuries of <i>Deois flavopicta</i> (Stal., 1854) in pastures under seed treatment with insecticides and dry mass yield

Pereira, Marcelo Francisco Arantes; Favare Junior, Alvaro de; Auad, Alexander Machado; Costa, Marilia Gregolin

doi:10.1590/1808-1657000722016

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SCIENTIFIC ARTICLE, AGRICULTURAL ENTOMOLOGY • Arq. Inst. Biol. 85 • 2018 • https://doi.org/10.1590/1808-1657000722016 copy

Survival and injuries of Deois flavopicta (Stal., 1854) in pastures under seed treatment with insecticides and dry mass yield

Sobrevivência e injúrias ocasionadas por Deois flavopicta (Stal, 1854) em pastagens submetidas a tratamento de sementes com inseticidas e produtividade de massa seca

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The present study evaluated the survival and injuries of Deois flavopicta (Hemiptera: Cercopidae) in pastures of Urochloa (Syn. Brachiaria) decumbens and U. brizantha, submitted to seed treatment with fipronil (Amulet^®) and thiamethoxam (Cruiser 350 FS^®), and dry mass yield. The experiment, carried out at the APTA Experimental Unity, São José do Rio Preto, SP, Brazil, was designed in randomly blocks, with six treatments (factorial 2x3) and four replications. Sowing was manual, with 12.0 kg ha^-1 seeds. Twenty adults were released on the plot, in a 40x40x70 cm cage, forty-nine days after sowing. The insects were sampled every two days during twelve days, without replacement of dead insects. Injuries caused by the spittlebug were evaluated by a rating scale and by productivity (dry mass yield). Data were analyzed by F-test and means compared by Tukey’s test (p≤0.05). The survival of adults was higher in the U. decumbens pasture than in the U. brizantha pasture. Results show that seed treatment with thiamethoxam reduced the survival of D. flavopicta in pasture formation, but did not influence the injuries caused by insect and the dry mass yield of forage species.

KEYWORDS:
Spittlebug; Urochloa decumbens; Urochloa brizantha; integrated pest management

Treatment	Days after infestation
Treatment	2	4	6	8	10	12
U. decumbens	58.33 a^1/	51.67 a	42.50 a	37.92 a	37.08 a	35.00 a
U. brizantha	62.08 a	47.08 a	41.25 a	36.25 a	28.75b	25.42b
F (E)	0.24	0.80	0.11	0.18	6.33	7.88
P (E)	0.6306	0.3859	0.7414	0.6749	0.0238	0.0133
control	68.75 a	55.63 a	49.38 a	40.63 a	36.88 a	34.38 a
fipronil	61.25 a	50.00 a	45.63 a	43.13 a	40.63 a	37.50 a
tiametoxam	50.63 a	42.50 a	30.63b	27.50b	21.25b	18.75b
F (TS)	1.89	2.20	9.49	6.19	12.83	11.54
P (TS)	0.1846	0.1458	0.0022	0.0110	0.0006	0.0009
F (E x TS)	0.51	1.63	1.05	0.35	0.11	0.10
P (E x TS)	0.6113	0.2291	0.3729	0.7073	0.8959	0.9016
CV (%)	31.08	25.46	21.75	25.74	24.65	27.68

Treatment	Stand - Plants.m^-2		Injuries^2/	Dry matter kg.m^-2
Treatment	12 DAS	27 DAS	Injuries^2/	Dry matter kg.m^-2
U. decumbens	147.67 a^1/	139.67 a	2.98 a	0.533 a
U. brizantha	128.00 a	117.17 a	1.50b	0.582 a
F (E)	4.22	2.92	20.78	0.60
P (E)	0.0577	0.1080	0.0004	0.4513
control	140.00 a	140.00 a	2.56 a	0.509 a
fipronil	126.50 a	116.00 a	2.09 a	0.616 a
tiametoxam	147.00 a	129.25 a	2.06 a	0.548 a
F (TS)	1.58	1.11	0.99	0.99
P (TS)	0.2382	0.3545	0.3934	0.3933
F (E x TS)	1.17	1.05	1.49	0.15
P (E x TS)	0.3372	0.3737	0.2573	0.8651
CV (%)	17.01	25.11	35.49	27.73

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[1] *Corresponding author: mfapereira@apta.sp.gov.br