Biological control of Cucurbita pepo var. texana (Texas Gourd) in Cotton (Gossypium hirsutum) with the Fungus Fusarium solani f.sp. cucurbitae
2011
Boyette, Clyde D. | Bryson, Charles T. | Hoagland, Robert E.
Experiments were conducted to evaluate various formulations and application methods of the fungus Fusarium solani f. sp. cucurbitae (FSC) for controlling Texas gourd (Cucurbita pepo var. texana) in cotton (Gosssypium hirsutum). In greenhouse tests, Texas gourd was controlled 93% and 96%, respectively, with preemergence (PRE) applications of FSC-infested cornmeal/sand medium (CMS) and FSC-wheat flour/kaolin (Pesta) granules. Postemergence (POE) applications of CMS or Pesta granular formulations were less effective overall. However, >90% control of Texas gourd was achieved with POE applications of FSC spores formulated in an emulsion consisting of 25% unrefined corn oil and 0.2% Silwet L-77 surfactant. Dew was not required to achieve optimal levels of weed control with either the PRE granular formulations or with POE corn oil/surfactant applications. In field tests, PRE applications of FSC-infested CMS and FSC-Pesta granules controlled 90-94% of the weeds. POE applications of FSC formulated in corn oil/surfactant were equally efficacious in controlling Texas gourd in cotton. No damage to cotton was observed.
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