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.
Young grubs feed on the roots of grass, while the adults feed on the foliage of over 300 plant species. In order to get rid of this pest, one of the worst in Minnesota, you need to guard your yard against the grubs and adults. Grub damage is easily identified in the yard by two characteristics. The first is a large, irregular brown patch. Secondly, the brown grass pulls away from the soil with little to no resistance. Application of a grub killer this fall and again in the spring is critical to guard your yard. Green Thumb Season-Long Grub Killer can be applied anytime during the spring, summer and fall and needs to be applied only once.