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Pine tree inspection

Hi, About 30 of our pine trees in one corner are dead. Need someone to inspect and identify the cause, and how to prevent other trees being affected. Can you please call me at --- , or send me a quotation asap? Thanks. The last two photos are other trees but close to those dead ones. Would like to know if they are being affected. Obviously it has much less leaves than Jan 2018. Not sure if that is normal due to the seasonal change and will getting greener & thicker. Jonathan