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茄株上共食群之空間分布型
177
Spatial Distribution Patterns and Optimal Sample
Size of Arthropod Feeding Guilds on Eggplant
Li-Hsin Huang
1
* , Mei-Chueh Lin
1
, Wen-Ying Su
1
, Chiou-Nan Chen
2
Abstract
Huang, L. H., Lin, M. C., Su, W. Y., and Chen, C. N. 2016. Spatial distribution patterns and optimal
sample size of arthropod feeding guilds on eggplant. Taiwan Pestic. Sci. 1: 143-177.
This study compared the composition of key pest communities in two eggplant
fields: one that had been treated with pesticides and one that had not. We also sought to
determine whether classifying pests according to feeding guild was useful for integrated pest
management applications. Spire leaves, expanded leaves, and flowers were collected weekly,
and the insects and mites they contained were inspected and classified in the laboratory.
Specifically, we recorded the family and superfamily or subfamily. Insects and mites were
then further classified into one of four feeding guilds according to mouthpart type, including
chewers, sucking-insects, sucking-mites, and internal suckers. Results indicated that sucking-
mites were most abundant on spire leaves; sucking-insects were usually found on expanded
leaves, flowers and fruit calyxes; and internal suckers always occurred on expanded leaves.
Results from Iwao
’
s m*-m regression and Taylor
’
s power law showed that sucking-mites
had a random distribution pattern and sucking-insects had a clustered distribution pattern.
When calculating the optimal sample size that is sufficient for effective decision-making
in pest management according to Taylor
’
s power law, if an expanded leaf contains 10
individuals, then 257, 649, and 209 leaves are needed to sample for Thripidae, Aphididae, and
Aleyrodidae, respectively. Conversely, when feeding guild is used, if there are 10 sucking-
insects on an expanded leaf, then the estimated sample size is 123 leaves. These results
indicate that the optimal sample size is lower for feeding guild than for single populations.
This finding suggests that applications related to pest density monitoring and pest control
decision making can use feeding guild in place of single pests.
Key words:
eggplant, feeding guild, spatial distribution patterns, sampling.
Accepted: September 30, 2016.
* Corresponding author, Email:
lhhuang@tactri.gov.tw1
Taiwan Agricultural Chemicals and Toxic Substances Research Institute, Council of Agriculture. Taichung.
2
Department of Entomology, National Taiwan University. Taipei.