Four major types of limestone formations (speleothems): Dripstones: Straws are thin walled hollow formations that resemble drinking straws. As water drips slowly from the roof of the cave, it deposits a microscopic ring of calcite crystal. These rings continue to build and can form straws many centimetres long.
If the sample has more than two or three grubs, you should probably take steps to reduce grub damage. Because grubs sometimes damage only parts of a lawn, take more than one sample if the lawn is damaged in patches.It might not be necessary to treat the entire lawn.t may even become possible to roll the turf up as if it were carpet. You should also control grubs if you notice other animals, such as crows, raccoons or skunks, digging up grubs in the yard and causing damage. In temperate climates, grub damage will be most pronounced during late summer and fall.
The threshold for lawn damage is 5 - 6 grubs per sq. ft. which means that if you have more than 5 grubs in a square foot area, you'll see extensive lawn damage. Repairing white grub damaged areas . Once the damage becomes visible, it's too late to control. Damaged white grub areas will not recover as the plant and root system is dead. Before making repairs the grubs will have to be removed either chemically or by hand. Manually removing the grubs is not hard once the dead grass is removed.