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Partitioning yield loss on yellow squash into nematode and insect components.

R McSorley, V H Waddill

    Journal of Nematology
    |March 20, 2009
    PubMed
    Summary

    Yellow squash yield losses from insect and nematode pests were significant, reaching over 30% in Florida field tests. Melonworm and specific nematodes were key culprits, impacting fruit weight and quality.

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    Area of Science:

    • Agricultural Entomology
    • Plant Pathology
    • Crop Science

    Background:

    • Yellow squash (Cucurbita pepo L.) is susceptible to yield losses caused by a complex of insect and nematode pests.
    • Effective pest management strategies are crucial for maximizing crop yield and quality.

    Purpose of the Study:

    • To quantify yield losses in yellow squash attributed to specific insect and nematode pests.
    • To analyze the combined and individual effects of insect and nematode control on crop yield.
    • To evaluate the accuracy of multiple regression models in predicting yield loss.

    Main Methods:

    • Field tests were conducted in southern Florida using permethrin for insect control and oxamyl for nematode and insect control.
    • Pesticides were applied alone and in combination to differentiate pest impacts.
    Keywords:
    banded cucumber beetlegreen peach aphidmultiple pest controloxamylpermethrinreinform nematodevegetable leaf-miner

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  • Multiple regression analysis was used to assess the contribution of various pests to yield loss.

    • Main Results:

    • Combined insect and nematode pest pressure caused estimated yield losses of 23.4% and 30.4% in the two trials.
    • The melonworm (Diaphania hyalinata) was a primary contributor to loss, along with nematodes (Quinisulcius acutus, Rotylenchulus reniformis) in the second trial.
    • Multiple regression models showed higher accuracy in predicting yield loss when both insect and nematode populations were considered.

    Conclusions:

    • Integrated pest management strategies targeting both insects and nematodes are essential for yellow squash production.
    • Rotylenchulus reniformis and Diaphania hyalinata represent significant threats to yellow squash yield in southern Florida.
    • Accurate yield loss prediction requires considering the synergistic effects of multiple pest types.