Abstract
1. This investigation dealt with the leaf responses of 30-day-old Stoneville 2B cotton plants to various concentrations of hexaethyl tetraphosphate (HETP), tetraethyl pyrophosphate (TEPP), and O,O-diethyl O-p-nitrophenyl thiophosphate (parathion). 2. Application of commercial formulations of HETP and TEPP in concentrations of fifteen to thirty times the recommended insecticidal dosage resulted in malformation of leaves subsequently produced. The malformation closely resembled that induced by 2,4-D. 3. HETP was more effective in inducing such leaf malformations than was TEPP. 4. Plants grown during the winter months exhibited more severe leaf malformation than those grown in the other seasons. The factors of light intensity and temperature are discussed in this regard. 5. Parathion applications resulted in the production of leaves which were many-lobed as contrasted to the three to five lobes of normal leaves.
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