Economic Injury Level for Contarinia texana on Guar123
- 1 October 1976
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Economic Entomology
- Vol. 69 (5) , 693-696
- https://doi.org/10.1093/jee/69.5.693
Abstract
A theoretical economic Injury level (EIL) was devised for Contarinia texana (Felt) infesting buds of guar, Cyamopsis tetragonoloba (L.) Taub. Since the presence of only 1 midge larva results in the abortion of a bud, the EIL is based on number of infested buds per sampling unit rather than on the larval population. Factors affecting the EIL include projected yield, management costs, market value of seed, plant diseases, date of planting, timing and amount of precipitation, and budding phenology. Since a strong correlation between the destruction of buds and yield loss in guar was found only for 45 through 90 days post emergence of the plants, control of the midge should be restricted to that period of buckling phenology. The theoretical EILs for C. texana in guar at the peak-budding period are 52, 38, 28, and 12 infested buds/row ft for guar having projected yields of 500, 750, 1000, 1500 lb of seed/acre, respectively.This publication has 1 reference indexed in Scilit:
- Budding Phenology of Guar in the Rolling Plains of Texas1Agronomy Journal, 1976