We describe a bond having one end slightly positive and the other end slightly negative as being polar. Inductive effects. An atom like fluorine which can pull the bonding pair away from the atom it is attached to is said to have a negative inductive effect.
These genetically modified organisms (GMOs) are designed for many reasons, including: pesticide and disease resistance, drought/frost resistance, increased yields, enhanced nutritional content and as a way to produce drugs or vaccines at low cost on a large scale.
Several factors may have caused this to happen. Power raking and removing all the thatch also encourage any weed seeds laying in the soil to germinate and grow. During drought years, the grass may have thinned out and whenever we've had rain, the weed seeds in the soil will germinate and grow.