Praise be to Allah.
If these insects are harmful, they may be killed with insecticides, but not with fire. The Messenger (peace and blessings of Allah be upon him) said: “There are five pests that may be killed whether one is in Ihram or not: rats, scorpions, crows, kites [a hawk-like bird], and mad dogs.” (Reported by Muslim, 2071) Another report adds a sixth, snakes.
Thus the Prophet (peace and blessings of Allah be upon him) told us that they are harmful pests, and that they are unlike other animals which do not do harm, and so he told us to kill them whether we are in Ihram or not.
If other creatures, such as ants or cockroaches or dung-beetles, cause harm, they may also be killed with insecticides, but not with fire.
For more details, please refer to the following answers: 105190 , 2896 , and 289055 .
And Allah knows best.
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