It's dengue season once again, and I have more reason than most to fear the disease. Last year, both my children had attacks of dengue and it was traumatic to nurse them through a disease that was so painful even in its mild form. This year, I've done a lot of research on natural mosquito repellents, for how much can one rely on the chemical stuff? Here are my tips --
Avoidance -- The Best Policy

Mosquitoes have complex methods of detecting hosts. If we are able
to understand why they home in on some individuals, and never bite
others, we would be equipped to avoid them better. Till then, here are
some simple ways of avoiding being bitten–

• Mosquitoes are attracted by dark clothing and foliage. So,
  avoid then by steering clear of bushes, woods and parks at times when
  mosquitoes are active. Also avoid wearing dark clothes.
  
• Mosquitoes home in on their victims by following the train
  of carbon dioxide they leave. Distract them by keeping a burning
  candle, incense or any fire around you.
• Mosquitoes are drawn to the sublte odour of Lactic Acid,
  released when we eat certain foods (like salty or high-potassium
  foods). You also release more lactic acid when you have been
  exercising. By avoiding these activities before mosquito exposure, you
  can avoid getting bitten.
  
• Mosquitoes are often attracted to the slightly cooler
  temperatures of the extremities. So keep them covered with socks or
  long sleeves if exposed to mosquitoes.
  
• Mosquitoes are attracted by perspiration because of the
  chemicals it contains and also because it increases the humidity around
  your body. That is why when you’re plagued by mosquitoes, a cool shower
  instantly brings relief.
  
• Keep your home and garden free from stagnant water, moist plants and uncovered water tanks. Mosquitoes breed in these.

• Lemon ecualyptus oil --Oil of lemon eucalyptus Eucalyptus
  citriodoraprovides provides protection against mosquito bites,
  according to the CDC.
  
• Lemongrass, citronella-- A good mosquito repellent, it is often added to candles and incense sticks.
  
• Neem oil --Neem oil is a good mosquito repellent, but smells quite strong.