The primary articles index rose by 2.1 percent to 249.3 from 244.1 for the previous month. Prices of egg, fish and wheat were the only falling metrics in this group.
Aditi Nayar, senior economist of ICRA expects WPI as well as core inflation to remain subdued for next couple of months unless there is sharp rebound in crude prices.
The April wholesale price index (WPI) number of 4.89 percent is way below the CNBC-TV18 poll, which had expected wholesale prices to have risen an annual 5.50 percent in April. In March, WPI was at 5.96 percent.
India's food price index declined 0.42% in the year to January 7, government data on Thursday showed, compared with an annual drop of 2.9% in the previous week.
Inching closer to the crucial double-digit mark, food inflation rose to 9.80% for the week ended August 13 on the back of dearer onions, potatoes, fruits and protein-based items.
Snapping a two-week declining trend, food inflation rose to 8.31% for the week ended July 2 on the back of soaring prices of protein-based items, cereals and vegetables.
India's food price index rose 8.53% and the fuel price index climbed 13.53% in the year to April 23, government data on Thursday showed.
The food price index rose 10.39% and the fuel price index climbed 12.56% in the year to February 19, government data on Thursday showed.
Inflation in India remains elevated despite tight cash conditions, suggesting the Reserve Bank should be more aggressive in raising interest rates as inflation spreads beyond food and primary articles.