To in effect get disembarrass of whitened spots on your petunias , it is authoritative to identify the cause of these spot . The most common causa of white spot on petunia is aphid and their debris . Aphids are small , soft - bodied insects that course on the sap of plants , causing equipment casualty and entrust behind a sticky remainder called honeydew melon . This honeydew melon can make a conducive surroundings for the growth of a fungal disease call sooty mold , which appear as white spots on the leaves .

Here are some dance step you could take to egest these bloodless spots on your petunias :

1 . Inspect your plants : Carefully essay your petunias for any preindication of aphids . Look for clusters of flyspeck , pear - shape insects , usually ground on the undersides of foliage or the tips of new ontogeny . to boot , check for the presence of honeydew or jet mould on the leave-taking .

2 . Remove affected leaves : If you notice any leaves heavily invade with aphid or overlay in jet mold , it is good to remove them from the plant . This will help prevent further spreading of the pests and disease .

3 . Spray with neem crude : Neem fossil oil is a natural insecticide that can be effective against aphid . blend the neem rock oil according to the didactics on the product label and spray it onto the moved areas of the petunias , making sure to coat both the tops and bottom of the leaves . Neem oil work by suffocating the dirt ball and disrupt their life cycle .

4 . Use an insect powder : If neem crude oil is not readily usable or if the infestation is severe , you’re able to use a chemical insecticide specifically formulate to plow aphids . select an insecticide label for use on petunias and follow the instructions cautiously . Be sure to spray in a well - ventilated sphere and avert spraying during blistering weather or when bees are active .

5 . Consider systemic insecticides : Systemic insecticides are immerse by the plant and provide long - lasting security against aphids . They are usually applied as a granule or a drench to the grunge around the genus Petunia . Systemic insecticides can provide ascendency for up to a few weeks , but be cautious of potential environmental impacts and follow the product label instructions .

6 . Repeat treatment if necessary : Aphids are persistent pests , so it may be necessary to echo the neem oil or insecticide treatment every 7 - 10 days until the infestation is under control . even monitoring of your petunias is crucial to take in any new infestation early on .

7 . Encourage good insects : Introducing or attracting natural predator of aphids , such as ladybug or lacewing , can help check the population of course . Planting companion flora like marigolds and Anethum graveolens can attract these beneficial louse to your garden .

Remember , bar is key to keep on your petunia healthy . Regularly inspect your plants for signs of cuss or disease , provide proper lacrimation and nutrition , and maintain good garden hygiene by removing any descend leaves or rubble that can harbor pestis . By taking these proactive measures , you’re able to help preclude succeeding infestations and keep your petunia front vibrant and spot - free .

Caroline Bates