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Risk assessment for tomato fruitworm in processing tomato crop-egg location and sequential sampling
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Orientador(es)
Resumo(s)
Helicoverpa armigera is one of the key pests affecting processing tomatoes and many other
crops. A three-year study was conducted to describe the oviposition preferences of this species on
determinate tomato plants (mainly the stratum, leaf, leaflet, and leaf side) and the spatial pattern of
the eggs in the field, to form a sequential sampling plan. Eggs were found mainly in the exposed
canopy, on leaves a (upper stratum) and b (upper-middle stratum) and significantly fewer eggs on
leaf c (middle-lower stratum) below flower clusters. This vertical pattern in the plant was found
in all phenological growth stages. The spatial pattern was found to be aggregated, with a trend
towards a random pattern at lower densities. A sequential sampling plan was developed, based on
Iwao’s method with the parameters of Taylor’s power law, with minimum and maximum sample
size of 20 and 80 sample units (plants), respectively (two leaves/plant). For its validation, operating
characteristic (OC) and average sample number (ASN) curves were calculated by means of simulation
with independent data sets. The -error was higher than desirable in the vicinity of the economic
threshold, but this sampling plan is regarded as an improvement both in effort and precision,
compared with the fixed sample plan, and further improvements are discussed
Descrição
Palavras-chave
Helicoverpa armigera oviposition preference spatial pattern Taylor’s power law Iwao’s procedure classification sequential plan
Contexto Educativo
Citação
Figueiredo, E.; Gonçalves, C.; Duarte, S.; Godinho, M.C.; Mexia, A.; Torres, L. Risk Assessment for Tomato Fruitworm in Processing Tomato Crop-Egg Location and Sequential Sampling. Insects 2021, 12, 13.
Editora
MDPI