Spatial distribution of soybean plants infested with whitefly <i>Bemisia tabaci</i> (Gennadius, 1889) (Hemiptera: Aleyrodidae)

Suekane, Renato; Degrande, Paulo Eduardo; Melo, Elmo Pontes de; Azambuja, Thiago Moreira; Menegati, Carlos Tutida

doi:10.1590/1808-1657000642016

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SCIENTIFIC ARTICLE, AGRICULTURAL ENTOMOLOGY • Arq. Inst. Biol. 85 • 2018 • https://doi.org/10.1590/1808-1657000642016 copy

Spatial distribution of soybean plants infested with whitefly Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae)^* * This study is part of the master’s thesis of the first author.

Distribuição espacial de plantas infestadas por mosca-branca Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae) em soja

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The determination of the spatial distribution of a pest is the first step in the establishment of a sampling plan, as sampling methods are contingent upon the type of spatial distribution of the specific pest studied, varying according to the number and size of samples in the area. This work aimed to study the spatial distribution of soybean plants infested with Bemisia tabaci, under field conditions, through the determination of the aggregation indices and the chi-square test of fitness to the main types of theoretical frequency distributions. The average percentage of whitefly (B. tabaci) infestation increasing after the V1 stage, reaching the maximum infestation of 60.3% in the R1 stage. At the R2 stage, the percentage of infestation ranged from 20 to 40%. According to the models of theoretical distributions studied, the Poisson distribution best defines the distribution of the whitefly.

KEYWORDS:
spatial arrangement; biotype B; dispersion index; Glycine max

Sampling	Date	Phonological State	Mean	Variance	I	I _δ	K
1	15/12/09	V1	0.430	0.631	1.468^ns	2.104^ns	0.918^AG
2	21/12/09	V2	1.320	2.341	1.773^ns	1.584^ns	1.706^AG
3	28/12/09	V4	1.510	2.171	1.438^ns	1.289^ns	3.446^AG
4	05/01/10	V7	3.350	5.300	1.582^ns	1.172^ns	5.753^AG
5	12/01/10	R1	6.030	6.716	1.113^ns	1.018^ns	52.980^RD
6	18/01/10	R2	4.470	2.494	0.558^ns	0.902^ns	-10.112^UN
7	29/01/10	R4	2.150	2.230	1.037^ns	1.017^ns	57.927^RD
8	01/02/10	R4	2.830	2.162	0.764^ns	0.917^ns	-12.002^UN
9	08/02/10	R5.1	3.720	3.072	0.825^ns	0.953^ns	-21.366^UN
10	18/02/10	R5.3	2.620	1.672	0.638^ns	0.863^ns	-7.243^UN
11	23/02/10	R5.4	3.880	2.470	0.637^ns	0.907^ns	-10.679^UN

Sampling	Date	Phonological State	Poisson χ²	bp χ²	bn χ²
1	15/12/2009	V1	38.748**	4.914*	6.104^ns
2	21/12/2009	V2	11.645**	15.893**	4.899^ns
3	28/12/2009	V4	3.113 ^ns	3.934*	16.519**
4	05/01/2010	V7	40.980**	107.610**	15.084**
5	12/01/2010	R1	5.572^ns	154.938**	38.131**
6	18/01/2010	R2	5.519^ns	5.037*	54.148**
7	29/01/2010	R4	1.108^ns	3.687^ns	30.997**
8	01/02/2010	R4	4.710^ns	2.556^ns	59.582**
9	08/02/2010	R5.1	0.957^ns	2.266^ns	63.500**
10	18/02/2010	R5.3	4.191^ns	1.286^ns	69.507**
11	23/02/2010	R5.4	8.758*	3.840^ns	82.803**

Instituto Biológico Av. Conselheiro Rodrigues Alves, 1252 - Vila Mariana - São Paulo - SP, 04014-002 - São Paulo - SP - Brazil
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[1] **Corresponding author: rsuekane@hotmail.com

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Spatial distribution of soybean plants infested with whitefly Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae)* * This study is part of the master’s thesis of the first author.

Distribuição espacial de plantas infestadas por mosca-branca Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae) em soja

ABSTRACT:

Spatial distribution of soybean plants infested with whitefly Bemisia tabaci (Gennadius, 1889) (Hemiptera: Aleyrodidae)^* * This study is part of the master’s thesis of the first author.