I have a white fungus that is killing my plants. After trying 3 different fungicides that did not work, I came to the place where people know about this. In the picture below you can see all that white stuff that is killing my plants. Thanks for your help in advance.

Not a fungus infection.  It appears to be a mealy bug infestation (a very common sucking insect pest). 

 

If so, you can reduce the population numbers significantly by washing them off with a strong water spray. And/or wipe them off with a rag or cotton gloved hand. 

 

If not on food plants, you can use a systemic insecticide soil drench. The insecticide will be taken up through the roots and translocated throughout the foliage, so that the sucking insects ingest the chemistry and die. Insecticide contact sprays have limited effectiveness because mealy bugs have a waxy protective coating that prevents chemical contact.

 

The most effective systemic insecticide will be a neonicotinoid class of pesticide, like dinotefuran active ingredient (Starkle in Thailand) for extremely fast uptake and kill, but limited residual effectiveness. Or imidicloprid active ingredient for slow uptake but one year or more residual effectiveness. Consider using both. 

 

Improving soil fertiity and plant nutrition will help the plants build natural resistance to pests and disease. Use of high NPK, high salt index chemical fertilizers are a pest magnet. 

 

I hope that helps, Don

Insecticides are only a short term fix. Repeated use will be detrimental to the beneficial soil biology and important metabolic functions. 

Focus on good growing conditions, soil fertility and water managment which promotes plant health and reduction of pests and disease.  

Healthy plants don't get pests. 

 

Hi Don, thanks I will try Starkle if I can find it. 

I have had a lot of success with wood vinegar on mealy bugs with my seedlings (several hundred) as well as bigger plants in protected areas, it is mixed with water and sprayed over the infected areas, I repeat it daily and it is usually gone within a week. Mealy bugs are most prevelent in a protected area without natural weather conditions(wind/rain/sun), you can also hose them off with a high jet of water, remove all leaf litter etc from around the plants base as well. Wood vinegar does not kill them but makes it unpleasant for them to remain on the plant, chemical treatments can be used as well, entirely up to you as to which way you go.