Population dinamic of snap bean pests on four growing seasons and its influence on productive parameters
DOI:
https://doi.org/10.5433/1679-0359.2003v24n2p283Keywords:
Empoasca kraemeri, Bemisia tabaci, Diabrotica speciosa, Phaseolus vulgaris L.Abstract
Insect pests of snap beans in northern Paraná state – Brazil were monitored during four growing seasons: March – May, May – June, August – September, September – November. Adults of leafhopper (Empoasca kraemeri), whiteffly (Bemisia tabaci) and corn rootworm (Diabrotica speciosa) were monitored weekly using a cone trap. Leafhoppers nymphs were counted in mid height trifoliate leaves. The productive parameters evaluated in harvesting were: number of pods / plant; number of marketable pods; number of damaged pods divided in bent pods, empty pods or bored pods. Insect infestation were lower in August – September growing period, which yielded higher percent of marketable pods. The highest population of leafhopper occurred in March – May period, when the percent of curved pods were also the highest. Maximum population of whitefly occurred in early season of March – May growing period. Leaf beetle (D. speciosa) population did not surpass de damage threshold in any growing period, but was higher in March – May season.
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